You can clean with a soft brush and peroxide.. It will take at least an hour for it too start cleaning up good then let it sit and repeat cleaning in a day or two the same way. the dirt and grim need time too remove itself from it but i see it not taking an hour or two too clean this button good enough too see more of it. You can also use hot water and brush if you do not feel like peroxide but that is really not the correct method too clean a button using just water but these buttons it is pretty much okay.