Removing stains caused by water on a glass cooktop can be tricky, as they generally can't be removed with regular detergent. Here are a few general cleaning tips to help you remove those watermarks.
Step 1 - Wipe Down the Surface
To make sure there is nothing else on the stove to remove, wipe down the surface with a warm, wet dish towel and a cleaning agent such as Bar Keeper’s Friend or Bon Ami. When purchasing a cleaning agent, always make sure that it is alright to use on a glass cooktop, as some agents may cause more damage to the surface.
When cleaning your whole cooktop, it is easiest to fill a small bucket or bowl with hot water and add the cleanser. Dampen your towel in the water and give the area a wipe down. This will allow even coverage of the detergent over the stove, and you will not have to use as much product, saving you a little money.
Give special attention to the spots that are most affected by rubbing hard and scrubbing. It is important to use a soft, clean rag and to never use steel wool or other abrasives that could scratch and harm the surface. Glass cooktops can be very expensive to replace.
This initial cleaning will also help remove burned food and any grease that may be lingering on your cooktop. However, to fully remove these you may have to use an additional product, such as grease remover.
Step 2 - Dry the Cooktop with a Towel
After going over the entire surface of your cooktop and paying special attention to the hard water marks, wipe it down with a soft dry towel or several paper towels to make sure that it removed the stains. If it doesn’t remove the stains right away, you may have to repeat the process a few more times.
Step 3 - Pay Extra Attention to Small Water Spots
If you only want to deal with smaller water spots on the surface of your stove, squirt a little cleaner (about the size of a dime) onto the spot you would like to clean. Using a dry paper towel or soft towel, rub the spot vigorously.
Some spots will not come out unless continually scrubbed over time. You may leave the detergent on for a little while to give it more power when scrubbing off, but it is not advisable to let water sit on your stove, as it could cause more marks.
Step 4 - Avoid Future Water Marks
Many water spots are caused when a pan boils over from cooking rice or pasta, although they can also result from cleaning your cooktop with a sponge or a damp paper towel.
Make sure you clean up every water spill on your cooktop as soon as possible to help prevent future watermarks. Use a soft cleanser and dry it with a soft dishtowel.
Maintain your glass cooktop by giving it a good scrub once a week with a good cleaner.