Cleaning permeable pavers

Does anyone know if there are or should be any concerns when pressure washing permeable pavers? I have a big job tonight and from the look of it seems pretty simple using my surface cleaner, but just want to make sure if theres nothing I’m missing.

Why clients need to tell the truth

Less then a week ago I get a call from a customer saying that he has some oil stains he wants removed from his driveway. My general question were as the following along with his answer. 1) How big is your driveway? He sent a picture 2) How long has the stain been...