I didn't want chemicals slopping over the plants under my deck, and there
was too much area to put drop cloths, (besides, it would take forever to
scrub 1500sf)so I used an electric pressure washer.
Okay, there were a few bits of minor damage, but overall it worked well. I
think the damaged areas probably needed to be cleaned out anyhow.
I first checked a number of Stain Mfg's sites; some say no pressure washers,
others say none over 1300psi.