I am painting a bedroom that has a textured ceiling painted white. The ceiling texture looks like a sponge-type application that was smoothed over slightly to allow some of the texture to still show through (I'm not sure what you call this). I have TSP to scrub the walls which are painted drywall. Do I use TSP on the ceiling also? Or what else should I use on the ceiling and do I clean with a sponge, rag, brush ...?