Sharpie is a brand of permanent markers. If you've written on a helmet and want to remove the marks from it, you'll need to use a number of solvents and methods to determine which one will work. Remove the stain as soon as you notice it because the longer it sits on the helmet the harder it will be to remove.
Things You'll Need
Water displacing spray
Dry erase marker
Dab rubbing alcohol on the ink stain with a cloth. Work from the edges of the stain toward the center. Use a new part of the cloth as the ink begins to transfer. Apply more rubbing alcohol as needed until the stain no longer transfers.
Spray cooking spray onto the stain and let it sit for a few minutes if the stain is still visible.
Brush the cooking spray into the stain with a toothbrush.
Wipe the stain up with a clean cloth.
Spray water displacing spray over the stain if you can still see it. Let it sit for several minutes.
Wipe the area up with a clean cloth.
Dab acetone onto the stain if it is still visible. Work until you remove all of the stain or as much of it as possible.
Draw over the stain with a dry erase marker. Dry erase marker ink will bond with the Sharpie ink and may make it easier to remove. This will not work for all types of helmets.
Let the ink sit for 10 minutes.
Wipe up the dry-erase marker and the Sharpie mark.