I painted my washroom with a “Pewter Grey” acrylic semi-gloss paint about a week ago. When I touched up some dark paint marks on my white ceiling, I accidentally got a couple spots of white paint (looks like a flat finish) on the walls. I immediately wiped the walls with a damp wet cloth (just water). However, the areas on the walls that have been wiped, now look dull when compared to the areas that were not wiped. It’s not significant, but it is still visible. I would appreciate any suggestions for fixing this!