Is it permitted to wash negel vasser into a sink when there are dishes inside it?
The Shulchan Aruch writes that the water of vegel vasser should not be washed onto the floor where people can walk because it has a ruach ra. R’ S. Z. Auerbach however said that it is permitted to wash ones hands into a sink even of it has dishes etc. inside it, since it i the norm to wash those dishes before using them, and since they will be washed it is alright. As a side point if the water was spilled on to food, the food should be washed off three times.
Ishei Yisroel 2 ftnt. 72, Halichos Shlomo 20 ftnt. 11.