---
title: "Exterior Cleaning Glossary — 42 Industry Terms | The Total…"
description: "Industry terms defined: soft wash, downstreaming, WFP, surfactant, efflorescence, and 37 more pressure-washing and window-cleaning concepts."
url: https://www.thetotalwash.com/glossary
source: https://www.thetotalwash.com/glossary
generated: 2026-04-23T08:08:20.174Z
---

Industry Reference

# Exterior Cleaning Glossary

42 plain-English definitions of the terms professional window cleaners, soft washers, and pressure washers actually use on the job — written by a working operator in Madison, WI, not copied from anywhere.

[A](#letter-A)[B](#letter-B)[C](#letter-C)[D](#letter-D)[E](#letter-E)[G](#letter-G)[H](#letter-H)[L](#letter-L)[M](#letter-M)[N](#letter-N)[O](#letter-O)[P](#letter-P)[R](#letter-R)[S](#letter-S)[T](#letter-T)[W](#letter-W)

## A

- [Acid WashAn acid wash in exterior cleaning is the application of a dilute acidic solution — most commonly muriatic (hydrochloric), phosphoric, oxalic, or a proprietary masonry blend — to dissolve mineral-based…Process & Methods](/glossary/acid-wash)
- [Algae vs. LichenAlgae (most commonly Gloeocapsa magma on roofs) is the photosynthetic organism responsible for the black streaks running down asphalt shingles, the green haze on north-facing siding, and the slippery…Stains & Contaminants](/glossary/algae-vs-lichen)
- [Alkaline CleanerAn alkaline cleaner is a high-pH detergent (typically pH 10-14) that dissolves oil, grease, fats, protein stains, and atmospheric grime by saponifying fatty acids and emulsifying petrochemical contami…Chemicals & Detergents](/glossary/alkaline-cleaner)
- [Anti-Slip TreatmentAnti-slip treatment is a chemical process — sometimes followed by a mechanical treatment — that increases the coefficient of friction on hard-surface flooring to reduce slip-and-fall risk when the sur…Process & Methods](/glossary/anti-slip-treatment)
- [Atmospheric FalloutAtmospheric fallout is the general term for the mix of airborne particles that settle on your home over time: diesel soot from trucks and buses, combustion residue from industrial areas, pollen, road…Stains & Contaminants](/glossary/atmospheric-fallout)

## B

- [BiocideA biocide is any chemical agent that kills living organisms — bacteria, fungi, algae, mold, mildew, lichen. In exterior cleaning, the most common biocides are sodium hypochlorite (bleach), quaternary…Chemicals & Detergents](/glossary/biocide)

## C

- [CavitationCavitation is the formation and violent collapse of vapor bubbles inside a pressure washer's pump when the water supply is insufficient, the inlet is restricted, or the water temperature is too high.…Science & Measurement](/glossary/cavitation)
- [Chelating AgentA chelating agent is a chemical that grabs onto metal ions — calcium, iron, copper, magnesium — and holds them in solution so they can be rinsed away instead of bonding to a surface. The word comes fr…Chemicals & Detergents](/glossary/chelating-agent)
- [Chem RatioChem ratio refers to the final dilution of cleaning chemistry at the surface — the percentage of active ingredient after the downstream injector, surfactant, and rinse water have all combined. For sof…Chemicals & Detergents](/glossary/chem-ratio)
- [Chimney CapA chimney cap is the metal (stainless, copper, galvanized, or aluminum) or cast-stone hood that sits on top of the flue, typically with a mesh screen on the sides. It serves three functions: it keeps…Building Components](/glossary/chimney-cap)
- [Crown CoatA crown coat is the sloped mortar or cement cap that sits at the top of a masonry chimney, surrounding the flue tile(s). It is not the decorative cap piece (that's a chimney cap) — it is the poured or…Building Components](/glossary/crown-coat)

## D

- [Damp ProofingDamp proofing is the application of a moisture-resistant coating or membrane to a masonry surface — most commonly foundation walls, brick veneer, and chimneys — to slow water absorption and reduce eff…Building Components](/glossary/damp-proofing)
- [Deionized WaterDeionized water — often shortened to DI water — is water that has had essentially all of its dissolved mineral ions removed by passing it through specialized ion-exchange resin beads. Positive-charge…Science & Measurement](/glossary/deionized-water)
- [DownstreamingDownstreaming is the technique of injecting soap or cleaning solution into the pressure washer's water line on the low-pressure side of the pump — downstream from the pump, hence the name. A chemical…Equipment & Techniques](/glossary/downstreaming)
- [Dustless GrindingDustless grinding is the use of a HEPA-filtered vacuum attached directly to a grinder, sander, or surface prep tool to capture dust at the source before it can become airborne. Traditional grinding —…Process & Methods](/glossary/dustless-grinding)
- [Dwell TimeDwell time is the interval between applying a cleaning chemistry to a surface and rinsing it off. It is the single most misunderstood variable in exterior cleaning. Chemistry does not clean instantly;…Process & Methods](/glossary/dwell-time)

## E

- [EfflorescenceEfflorescence is the white, chalky, powdery deposit that forms on the surface of brick, concrete, stone, stucco, and block masonry when water dissolves mineral salts inside the material and carries th…Stains & Contaminants](/glossary/efflorescence)

## G

- [GPM (Gallons per Minute)GPM stands for Gallons Per Minute — the volume of water a pressure washer delivers per minute of operation. While PSI gets the headlines, GPM is what actually does the cleaning. Think of it this way:…Science & Measurement](/glossary/gpm)

## H

- [Hard Water StainA hard water stain is the crystalline mineral deposit that forms on glass, metal, and stone when water high in dissolved calcium, magnesium, iron, or silica evaporates and leaves its dissolved mineral…Stains & Contaminants](/glossary/hard-water-stain)
- [Hot Water Pressure WashingHot water pressure washing uses a diesel-fired burner to heat the pressure washer's output to 180-200°F before it hits the surface. The physics is simple: hot water dissolves grease and oil, accelerat…Equipment & Techniques](/glossary/hot-water-pressure-washing)

## L

- [Ladder StabilizerA ladder stabilizer (sometimes called a standoff or wall extension) is a steel or aluminum arm that bolts to the top rails of an extension ladder, extending the contact points out past the gutters and…Equipment & Techniques](/glossary/ladder-stabilizer)

## M

- [Mildew vs. MoldMildew and mold are both fungi, but they behave differently. Mildew is a flat, surface-level growth — usually white, gray, or yellowish — that stays on top of a substrate and can typically be cleaned…Stains & Contaminants](/glossary/mildew-vs-mold)

## N

- [Non-Ionic SurfactantA non-ionic surfactant is a surfactant whose molecule carries no net electrical charge, making it uniquely tolerant of the extreme pH and high chlorine content found in a soft-wash mix. Ionic surfacta…Chemicals & Detergents](/glossary/non-ionic-surfactant)

## O

- [Organic vs. Inorganic StainOrganic stains are caused by living or once-living things: algae, mold, mildew, lichen, tannins from leaves, berry drip, insect excretion, pet urine, and so on. They contain carbon and respond to oxid…Stains & Contaminants](/glossary/organic-vs-inorganic-stain)
- [OxidationOxidation is the chemical reaction between a surface and oxygen (plus UV light, moisture, and time) that produces a chalky, faded, or dulled appearance. On vinyl siding, oxidation shows up as a powder…Stains & Contaminants](/glossary/oxidation)

## P

- [PercarbonateSodium percarbonate is a solid granular compound that releases hydrogen peroxide and soda ash when dissolved in warm water — essentially an oxygen-based bleach. Unlike chlorine bleach, percarbonate do…Chemicals & Detergents](/glossary/percarbonate)
- [Pollen & HoneydewPollen and honeydew are two separate sticky contaminants that are constantly blamed on each other. Pollen is the yellow dust that coats Wisconsin cars, siding, and windows every spring from late April…Stains & Contaminants](/glossary/pollen-honeydew)
- [Polymer SealerA polymer sealer is a protective coating applied to a cleaned and dried surface — glass, concrete, wood, metal, brick — that forms a long-molecule chain on the surface to repel water, dirt, and staini…Chemicals & Detergents](/glossary/polymer-sealer)
- [PoulticeA poultice is a paste-like cleaning compound applied to a porous surface — natural stone, unsealed concrete, brick, limestone — to draw a stain out of the pores through capillary action. The paste is…Process & Methods](/glossary/poultice)
- [Pressure vs. VolumePressure (PSI) and volume (GPM) are the two fundamental outputs of a pressure washer, and understanding the tradeoff between them is the single biggest step an amateur can take toward professional-lev…Science & Measurement](/glossary/pressure-vs-volume)
- [PSI (Pounds per Square Inch)PSI is the unit of pressure used to rate pressure washers, measuring the force of water exiting the pump per square inch of surface area. Consumer pressure washers run 1,500-2,500 PSI; professional ri…Science & Measurement](/glossary/psi)

## R

- [Reverse Osmosis (RO)Reverse osmosis is a water purification technology that uses pressure to force water through a semi-permeable membrane so fine that it blocks dissolved minerals, bacteria, and most organic molecules w…Science & Measurement](/glossary/reverse-osmosis)

## S

- [Soap DistanceSoap distance is the maximum height or horizontal reach at which a pressure-washer rig can project cleaning solution through a low-pressure soap nozzle. It is a direct function of GPM, pump pressure,…Equipment & Techniques](/glossary/soap-distance)
- [Sodium HypochloriteSodium hypochlorite (NaOCl) is the active ingredient in household bleach and the primary disinfectant used in professional soft washing. It is sold to exterior cleaners in 12.5% concentration (commonl…Chemicals & Detergents](/glossary/sodium-hypochlorite)
- [Soft WashSoft washing is a low-pressure exterior cleaning method that uses biodegradable detergents and a controlled bleach solution to kill the algae, mold, mildew, and bacteria that cause staining — rather t…Process & Methods](/glossary/soft-wash)
- [Soft-Bristle BrushA soft-bristle brush is the wash head of a water-fed pole or the hand tool used to gently agitate a surface during cleaning without damaging the substrate. For glass, a double-row flocked nylon or hog…Equipment & Techniques](/glossary/soft-bristle-brush)
- [Surface CleanerA surface cleaner is a circular attachment — typically 16, 20, or 24 inches in diameter — that replaces the wand on a pressure washer for cleaning flat horizontal surfaces. Inside the housing, two or…Equipment & Techniques](/glossary/surface-cleaner)
- [SurfactantA surfactant (short for "surface-active agent") is a chemical compound that lowers the surface tension of water so it can wet, spread, penetrate, and cling to a dirty surface instead of beading up and…Chemicals & Detergents](/glossary/surfactant)

## T

- [TanninTannins are natural plant polyphenols — the same compounds that give red wine, tea, and oak bark their characteristic astringent flavor. In exterior cleaning, they are the source of the persistent bro…Stains & Contaminants](/glossary/tannin)
- [TDS (Total Dissolved Solids)TDS stands for Total Dissolved Solids — the concentration of dissolved minerals, salts, and metals in water, measured in parts per million (PPM). A TDS meter is the single most important tool in profe…Science & Measurement](/glossary/tds)

## W

- [Water-Fed Pole (WFP)A water-fed pole is a lightweight telescoping pole — typically carbon fiber, 20 to 45 feet long — with a soft brush and water jets at the tip, fed by a hose connected to a pure-water filtration system…Equipment & Techniques](/glossary/water-fed-pole)
- [Weep HoleA weep hole is a small, deliberately-placed opening at the bottom of a brick-veneer wall, window frame, or storefront glazing that lets trapped water drain out. On brick homes, weeps are typically ver…Building Components](/glossary/weep-hole)

---
Source HTML: https://www.thetotalwash.com/glossary
This markdown mirror is auto-generated from the live page. For the full site corpus, see https://www.thetotalwash.com/llms-full.txt