I bought a Intellivision. It works after I used some canned air and cleaned the cartridge (pitfall), .....barely
Here's the funny part, besides the disc, most of the buttons make him run to the left. I couldn't get Pitfall Harry to jump at all!!

What is the proper way to clean out this system and the games? I use Isopropyl Alcohol, 91%(I can't find 99% around here)
I know I'm missing a step or two, can you help a guy out? I admit I am dumber than dirt, I enjoy the game but know nothing about the innards or how to clean it right!