Keyboard Yellow keys to white solution?

yellow dirty keys clean. process let me know please.

Hydrogen Peroxide. I buy the bottles of cream off Amazon and smear it on them and then cover with plastic wrap and set in the sun for a day. Sometimes I’ll do a second coat. Other people just soak them in it in a bucket but haven’t tried that. You can find tutorials on YouTube on how to do it. Make sure you clean any dirt off first.