wear and tear

noticing a sign of wear & tear. the power button on the desktop pc isn't sticking like it should. have to press it just right to power up. i expected something like this would come up, it is over two years old and harsh humidity doesn't do any good. then again, a short spray of "something you shouldn't spray on it but it will make it stick like new" would fix it, but for the life of me i can't remember what it's called. what i can do at least is to be extra careful and be patient. the last thing i want is to lose my cool and press it too hard - that'll muck it up for sure!