we used the peroxide with a spray bottle. No scrubbing, just kind of kneaded and dabbed, moving the cloth a lot to make sure always using a spotlessly clean area.
we would let it totally dry overnight, then back at it the next day. We must have redone the procedure ten times, but there is absolutely no trace of any stain or "fuzzy" looking area on our ceiling.
Gentleness and patience paid off.
2003 Winnebago Brave 34D
Gib, Anne, and Songchie (our cross-eyed blue point Siamese)