Hand holding a roll of parchment paper
The Parchment Paper Trick To Clean Hard Water Stains
Hard water stains are stubborn deposits of minerals left behind by dried and evaporated hard water. Removing these stains typically requires lots of effort and heavy-duty cleaners.
Thankfully, however, you can remove hard water stains from faucets and kitchen sinks by simply crunching up a sheet of parchment paper and rubbing it all over the mineral deposits.

The parchment paper trick is so effective that, in some cases, it's been seen to wipe away months' worth of hard water stains in seconds without requiring much physical effort.