I keep a bottle of the 91% ISO around. Make sure the label says isopropyl alcohol and distilled water AND THAT'S IT. No other stuff.
And I wish people would not refer to it as rubbing alcohol...since that could contain other stuff. So ISO is ISO. Rubbing Alcohol is ...undefined.
It dries away without residue over time. Small amount won't hurt anyone. Drinking a pint (or is that quart or more?) of it will hurt/kill. However, we're talking about a drop of residue if any at all. Small amounts are metabolized without harm. Large amounts can't be metabolized effectively and you die. Hence "It's the dose that makes the poison".
I use it once in a while to clean stuff including stubborn
coils. However, hot water works almost as well in most cases. Just dry well.