Why didn't someone think of this sooner? It's brilliant! (And it would have saved me a lot of time while hand-washing wine glasses. Especially after our Annapolis Wino Club parties...)
These sponges fit perfectly into fluted glasses or wine glasses, plus there's a tiny slot in the sponges to get the glass rims (and get rid of gross lipstick marks). So smart!
Available here. Spotted here.