Anyone with hard water in their community can relate to the problem of some pretty impregnable stains. Cool Tools has a nifty solution for this:

I used to scrub fruitlessly at toilet bowl rings until one day I tried pouring in some white vinegar (maybe a cup or two) and leaving it overnight. Everything came off in about a minute after that.

The tip goes on to add that if you're in a hurry, you can leave the vinegar in there for as little as twenty minutes; I've gotten this to work on showers and sinks as well.

 

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