Sometimes, your windows look clean, but they have watermarks that don’t seem to be removable no matter what you do. Here’s how you can remove them in a few easy steps:
Mix one cup vinegar with some water (preferably with a 50-50 ratio) and put the mixture in a bucket
Soak a paper towel into the bucket and wipe the spots
Dry off the surface using a dry sponge or lint-free cloth
For lingering spots, scrub them off with a toothbrush after applying the solution. Repeat until the spots are completely removed
You don’t have to use vinegar if you’re worried about the smell. Some of the best alternatives include rubbing alcohol, ammonia (NH3), and lemon juice. However, alcohol and NH3 may leave some residue behind, so you might end up using vinegar to remove them anyway.
On a side note, if you’re going to make the mixture with ammonia, make sure that you put on a pair of protective gloves since it can burn your hands