Tanked
Recently Berta got the idea to pull the twenty-gallon fish tank out of the guest room and clean it up so that we could once again use it to contain fish. The tank still had little rocks in it left over from our last functional tank, but in addition to the dried scum that seemed impossible to remove from the glass, that’s about all we had.
As it turns out, a little vinegar will remove all of the scum from the tank. She removed the rocks into a little plastic trash bin (which sat like some kind of modern art sculpture on our kitchen island for a while) and proceeded to scrub the tank to good effect.