You really should not use a pressure washer of any sort. Pressure washers will force water into places you thought water couldn't go. Places such as valve cover gaskets, pulley bearings, alternator bearings, crankshaft end seals. The water can also penetrate the outer covering one hoses and wire bundles causing damage you won't see until it is too late.

If the product you are using doesn't work with a rinse from a garden hose, you should not use it. Simple Green (I am not being paid in anyway) does work with just a light rinse. I even use a spray (not straight stream) from the hoes end. Best of all Simple Green is biodegradable. Just rinse the drive way off when your done.

It also works on tires and rims.

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2007 Suzuki Vinson 500 4X4
2007 Toro 6.5hp
2006 BMW X5 4.4 ltr (his)
2001 BMW X5 4.4 ltr (hers)
1994 Honda XR650L
1984 Honda XR80

"Beer is proof that God loves us and wants us to be happy."
Benjamin Franklin