Mr Clean magic eraser!! I love it!!! It took crayon off of a wooden door that had been there at least 10 years. Just be careful with it, it is a very mild abrasive.
Abrasive: There are two types of abrasives, loose and bonded.
Loose abrasives can be used to hone any de-lipped surface and should not be used on any uneven surface. Loose abrasives will not work well in moderate to heavy traffic areas. They work great on counter tops. Loose abrasives are sold in a powder form.
Bonded abrasives can be used to remove lips from the surface. Choosing the correct bond is very important. They are sold in metal, copper, and resin bond. To remove lippage the metal will work best. But they are very aggressive. Copper will work on lippage but it will take about 25% more time to complete the same task. If the surface was already de-lipped the copper will remove deep scratches from the surface. Resin is the least aggressive of the bonded abrasives. Resin bonds wonâ€™t remove lips. However, they work well on light traffic areas.
Try the Mr. Clean Magic Eraser. Our bathtub is the worst ever to clean beause my husband comes home greasy everyday after work. The grease sticks to the bottom of the tub. If the Magic Eraser can get the tub clean from all the grease build-up, it can take off a permanent marker. Just remember to have the Magic Eraser wet when you are using it.