I have dunked at least 3 nubuc Sonomas. They didn't come out duller. They just didn't come out brighter. Even brushing didn't help. You know how when you dunk a leather bag and the leather always comes out a deeper, richer color? That doesn't happen with nubuc so it isn't very satisfying. They didn't get noticeably cleaner either. If you've got water splatters I think you should go for it. The only way it would get worse is if the lining bled. I was very careful with mine to make sure the wet lining didn't touch the purse while it was drying.I was thinking of dunking my nubuc hippie flap but did a search for "nubuc" on this forum and Voila! from just a few days ago. Does that mean the color actually came out duller after you dunked it? (I'm assuming you dunked it...?) I was brushing my bag and realized there are a bunch of marks (just water splatters I think) on the front flap and was considering dunking it to even it out. No go?