[porsche tech]

I have a Dell Inspiron N5110 that is probably about 10 years old and has Windows7. Lately I have been having to press very hard on several of the keys to get them to work. When I googled this problem, there is a lot of talk about replacing the keyboard which of course is not worth it on a computer this old. I have sprayed the keyboard with Wurth contact cleaner (which is an excellent product left over from my Porsche days) and blew it off with compressed air. Now as I type this it appears to be operating better but not perfect. Anyone know any other solutions?