Can I use disinfectants as detergent with my SPX4004-MAX pressure washer? Yes, you can use disinfectants as detergent with your SPX4004-MAX pressure washer, but it is important to use a disinfectant with a neutral pH. Using a disinfectant with an acidic or alkaline pH can corrode parts of your pressure washer. Related articles What type of detergents can I use with my SPX4004-MAX pressure washer? What detergents can I use with my SPX3160 pressure washer? Can I use disinfectants as detergent with my SPX7001E pressure washer? Does my SPX3000 pressure washer have a downstream or upstream detergent injector? What is the orifice size of the nozzles included with my pressure washer?