This is the point of no return. If you are not sure you want to continue, this is your last chance. Everything up until now can be undone with ease.
Put your keyboard in the oven at 100-150°C and bake until golden brown. (To clarify, do not leave it in that long!). Allow the entire keyboard to reach temperature and idle there for about 5 minutes, then remove it from the oven. Careful, it's hot!