Is it safe to assume that whatever paint doesn't come off the siding
with a high-pressure jet of water is OK to leave in place and paint over
-- with primer first, of course?
Or does it still need a good scraping and/or wire-brushing?
It needs scraping. I just power-washed a wall. and only part of the loose
paint came off. A ton more came off with the scraper.
If you use the power washer enough to get _all_ the loose paint off,
you'll damage the wood.
Note: Wait a few days before priming to let the wood dry out.
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