Clean water is only necessary for final rinse. The less foreign materials in your wastewater, the easier it is to pretreat or treat. Eliminates the chance for hazardous materials to go down the drain. Helps ensure it is operating properly. Reduces solvent loss due to evaporation.
Pressure washers clean vehicle parts with hot water and detergent at high pressures.
The wastewater generated by this process is not hazardous. Contact local wastewater authorities prior to purchase, to see if any local regulations restrict hot soap wastewater discharge to the sanitary sewer. Reduces solvent use. In larger shops, this may be an economical way to remove dirt, oil, and grease from parts. The oven burns off the oil and then burns off the airborne particles before release into the atmosphere.