- If the cork coaster is not engraved, you can first pass it a smooth sandpaper of 240 then wash them with a sponge and soap, they will be like new.
- For engraved or painted cork coasters, you can wash it with a damp cloth and soap.
For a deeper cleaning with a Hydrogen Peroxide Solution 3%.
Pour out the hydrogen peroxide from the bowl. Rinse each coaster under warm running tap water with a soft sponge and then towel off any excess water.
Remember Put the coasters in an upright position to air dry overnight before using again.