Painting a few room in a home that has not been painted in 15 years. The ceiling shows signs of where joists are...you can see the lines...perhaps this is dirt...not sure. I assume I ned to clean to ceiling and walls. Will a simple wipe down with a damp sponge suffice....at least to get the dust off?
I know I used TSP in my home but that was after removing wallpaper to get the residue off...I'd hate to have to go to that extreme if unnecesary...especially sime kids and pets are around and I recall that a nasty chemical.