1. Use cold water & soap / shampoo
Find a bowl that's big enough for your mousepad, or if you want more space, use your bathtub. Gently spray cold water on the surface while using a sponge filled with hand soap or a simple shampoo to clean the stains.
2. Scrub with a soft brush
Use a soft brush to scrub any spots that are particularly hard. You do not want to rub too hard or use a steel sponge, as you could damage the surface of the mousepad .
3.Rinse
Gently rinse the soap from the mousepad with cold water and make sure you do not leave foams on the front or back.
4. Dry with a towel
Now that everything is clean, use a towel to dry your mousepad. Let it air dry or place it next to a fan to get rid of any remaining moisture. Give it the rest of your day before you use your mousepad again, as you don't want moisture to ruin your mouse or computer.
Small Tips
Yes, you can put your mousepad in the washing machine if you don't want to clean it by hand. Preferably wash mousepads made from the following materials:
Polyester, Nylon, Acrylic, Microfibre, Foam, Plastic
How to wash them in the washing machine: