Pressure, heat, and chemistry each do something the others can’t. Pressure supplies force. Heat liquefies grease and speeds up chemical reactions. Chemistry is what actually lifts soil off the surface and holds it in suspension so the rinse carries it away.
Most disappointing cleaning results we get called about are a chemistry problem being solved with more pressure. This is how to match the cleaner to the soil instead.
Every pressure-washing detergent does three jobs, in this order:
A product that lifts soil but doesn’t suspend it just moves the mess. That’s why cheap soap often looks like it’s working until the surface dries.
| Soil | What works | Notes |
|---|---|---|
| Grease, oil, diesel soot | Alkaline detergent | The everyday fleet problem. Hot water multiplies the effect |
| Road film, general traffic grime | Alkaline detergent with surfactant | Bonded film needs dwell time more than pressure |
| Food soils, protein, fats | Alkaline detergent | Food-processing and restaurant work; hot water essential |
| Mineral scale, milkstone, hard-water film | Acidic cleaner | Dissolves mineral deposits that alkaline cleaners leave behind |
| Rust staining | Acidic cleaner | Surface-dependent; test first |
| Carbon and baked-on deposits | Alkaline detergent plus heat, or steam | Chemistry alone won’t get there |
| Biological films, algae, mildew | Alkaline detergent, or a sanitizing product where required | Sanitation requirements vary by facility |
| Delicate or coated surfaces | Neutral or mild alkaline; test a panel | Aggressive chemistry is how coatings get ruined |
Cleaners are described by where they sit on the pH scale, and that’s the shortest path to choosing one:
Two cautions that cost real money:
Downstream injection draws detergent into the water stream after the pump, which dilutes it heavily — commonly in the range of 10:1 to 20:1 depending on the injector and metering. That’s why “the soap isn’t working” often means the ratio is wrong, not the product.
Metering valves let you adjust the draw rate. If your machine has one, tune it against the product’s recommended dilution rather than running it wide open.
Dwell time is where most operators leave results on the table. Apply, let it work, then rinse. Letting detergent dry on a surface is the opposite — it leaves residue, streaks, and sometimes damage. Work in sections sized to what you can rinse before it dries, which in Florida heat means smaller sections than you’d think.
Water hardness matters. Hard water minerals bind surfactants and can leave films of their own. On hard Florida water, more detergent is not always the answer — softening the water or using a product formulated for hard water is.
Hot water and detergent aren’t alternatives; they’re multipliers. Heat liquefies grease so the surfactant can reach it, and it accelerates the chemical reaction. This is why a hot water machine with an ordinary detergent outperforms a cold water machine with an aggressive one on greasy soil — and why adding hot-water capability is often the better investment than escalating chemistry.
Chemistry choice is a compliance input, not just a cleaning one. Florida DEP’s BMP guidance for vehicle and equipment washing recommends phosphate-free biodegradable detergents, and wash water — with whatever chemistry is in it — has to be managed rather than discharged to a storm drain. Biodegradable formulations reduce the load on whatever treatment or containment route you’re using.
Sun Pro’s cleaning formulations are biodegradable and don’t separate or degrade in storage the way generic detergents do. SDS and technical data are available on request.
What’s the best degreaser for a pressure washer?
An alkaline detergent matched to the soil and the surface, applied with dwell time, and rinsed before it dries — with hot water if you have it. There’s no single best product; there’s a best product for a specific soil on a specific surface.
What’s the difference between a degreaser and a detergent?
Degreaser is a description of the job, not a category of chemistry. Most products sold as degreasers are alkaline detergents with higher concentrations of surfactants and builders. A detergent for general washing and a degreaser for heavy grease are usually the same family at different strengths.
Can I use household cleaners in my pressure washer?
No. Household products aren’t formulated for downstream injection or for the surfaces commercial equipment touches, and some — bleach, ammonia, abrasive cleaners — cause damage or dangerous reactions. Use products intended for pressure-washing equipment.
Why doesn’t my detergent seem to work?
Check three things in order: dilution (is the injector drawing enough?), dwell time (are you rinsing too fast, or letting it dry?), and temperature (are you trying to cut grease with cold water?). In most cases it’s one of those, not the product.
Do you supply the chemistry along with the equipment?
Yes — detergents, degreasers, and wastewater-treatment chemistry, matched to the equipment and the application. See our cleaning chemicals page for what we carry, or ask us what fits your soil.
Tell us what you’re cleaning, what surface it’s on, and what machine you’re running — we’ll recommend the chemistry and the dilution rather than selling you the strongest thing on the shelf.
Call (904) 693-2155 or request a recommendation. Sun Pro Supply supplies and services commercial cleaning equipment and chemistry across Duval, Clay, St. Johns, Putnam, Marion, Alachua, and Columbia counties. For fleet applications, see fleet and truck wash equipment.
