The driveway is already clean...lets see it on a mossy one.
Exactly!
I have the same set up but would never dream of cleaning drives with it, the waste tank and inline filters get clogged up really quickly and the flow rate is not as high normal pressure washers as the water has to pass through a heat exchanger and the solution line is a smaller diameter. Plus you use the same vac hose & solution line as you take into people's homes........ But it gets covered in dirt so needs to be cleaned between jobs