How to clean tall walls for painting
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TSP works on everything..
Use a long-handled sponge mop or microfiber mop that is slightly damp to scrub off dust, etc. Allow to dry completely before painting.
Use a proper ladder or scaffold and wash with TSP, let dry, then prime, then paint.
Hope one of these articles is helpful.
https://www.todayshomeowner.com/how-to-paint-over-ceramic-tile-in-a-bathroom/
https://www.doityourself.com/stry/paintceramictile
I have a long handled duster I use first to grab the dust. Does it really need cleaning? Most walls I've painted usually have marks that need to be cleaned are within reach (scuffs, etc.).