As we stated earlier, most modern-day pressure washers come with a handy detergent tank you can fill with the soap of your choice. This is the advantage of investing in a quality, versatile pressure washer – you don’t have to worry about lugging around a bucket of soap! After you’ve located your detergent tank, fill it with the pressure washer detergents you’ve selected for the job. Then, close up the tank and turn the nozzle to “on”.