The washer gets the attention, but the cleaner is what actually removes the soil. Choosing the right parts washing detergent or solvent — and running it at the right concentration and temperature — makes the difference between parts that come out clean on the first pass and parts you have to run twice. Here is how to pick.
Match the cleaner to the machine
The first rule is simple: use an aqueous detergent in an aqueous washer and a solvent in a solvent washer. They are formulated for different equipment and soils, and mixing them up wastes product and can damage pumps or seals. If you are still deciding between the two systems, read Comparing Aqueous and Solvent Parts Cleaning.
Aqueous detergents
Water-based detergents clean with heat and chemistry rather than solvency. They are non-flammable, low-odor, and easier to dispose of. Pick a low-foaming formula for recirculating and spray washers so the pump does not cavitate. Build-All offers cleaners like the low-foaming aqueous degreaser and the SB300 alkaline cleaner for ultrasonic and immersion cleaning.
Solvents
Solvents cut heavy grease and oil fast and dry quickly, which is why they are common for brake and driveline work. They are flammable and create hazardous waste, so handle and store them accordingly. Browse Build-All cleaning chemicals and solvents.
Concentration, temperature, and filtration
- Concentration: follow the label. Too weak cleans poorly; too strong wastes product and can leave residue. Test and top up rather than guessing.
- Temperature: aqueous detergents need heat to work — here is why an aqueous parts washer needs to be heated.
- Filtration: keep the fluid clean and it lasts far longer — see parts washer filtration and maintenance.
Not sure what to run?
Tell us your parts, soils, and washer type and we will recommend a cleaner. Browse Build-All cleaning chemicals or contact us for a recommendation. New to parts washers entirely? Start with our buyer’s guide.