How should I clean walls before painting?
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Best thing to use before painting to remove grease and dirt?
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TSP is what I use.
Use TSP, buy at hardware stores.
https://homeguides.sfgate.com/grease-off-wall-before-painting-28872.html
TSP works great
Krudkutter and a magic eraser. I wipe the wall down with damp microfiber cloths to remove any residue.
I use TSP to clean walls and furniture before painting. It works well.