My powerbutton gets stuck while pressed down, causing the phone to turn of and not wanting to turn on again. It is very possible that it is dirty… How do I go about cleaning it? Is there a tutorial? Any solvents or cleaning agents you can recommend?
I would advice you to clean the button with a tooth stick. You should not use any solvents (plastic and electronic parts can break).
Here is a tutorial from iFixit how to open the midframe and reach the power button: