1. Make a vinegar solution - Prepare a 50/50 mixture of water and white vinegar in a spray bottle.
2. Spray the vinegar on the scummy surface - Vinegar has a pungent smell but it's completely safe to use on surfaces other than wood. 3. Spray the area thoroughly, making sure you don't miss any spots.
4. Try letting the vinegar sit on the hard water spots.
5. Rinse and squeeze the area clean - Then buff dry with a clean cloth. Make sure it's totally dry - otherwise, the water will leave more spots!
Hope this helps!