Well I own the Roland XP-80 and I kinda had the same problem. I used Goo-Gone. Its a Citrus based cleaner. I just dabbed on a few drops on a terry cloth and rubbed the stains right off. Make sure you only use it on the keys, not the black top of the Synth. Not sure if it will rub the color away. Well try that Goo-Gone and get to me. Good Luck
