Since you're selling soon, I'd just prime and paint.
I'm not sure washing is easier than sanding, if you have a sanding pad
that attaches to a pole [like drywallers and some painters have]. A
paint shop will have pads and poles.
And 320 seems awfully light to me. I'd go with nothing less than 200,
probably 150. Or you go with the sanding screens.
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