Oh, how versatile this is!
For example, did you know rubbing alcohol can remove permanent marker stains from finished wood floors and solid-surface counters? Just pour a small amount on a cotton ball and apply to the offending mark. Don't worry about damaging the wood — this technique works because you're only using a small amount.
This also rings true for ink stains. Apply a bit to any clothing that has been stained, let it sit for 5 minutes, and wash normally. The spot will come right out.
And those dirty bathroom mirrors? A quick swipe of rubbing alcohol will remove makeup stains, hairspray, toothpaste, and anything else that has found its way from sink to mirror during your morning routine.