Espresso Steam Cleaner?

The steamer function on my espresso maker still works, so I can still make steamers (steamed milk + flavoring - caffeine). I put too much water in, so I had lot of extra steam to come out. Put the espresso maker over the sink, and let the steam go into the sink. It totally cleaned out the sink. Normally, I take a Magic Clean Eraser to it to remove any staining, but the steamer did it without elbow grease. Funny, right?