Ok, I'm new to repairing speakers, though I've had my AR3's for 15years since my father gave them to me. I am only getting sound from both the woofers, and nothing from the tweeters or mids. I've searched the forums. I've figured out I should try to clean my pots, but I can't find a post that will tell me how. How do I remove them, what do I clean, with what can I clean them (sand paper/emery paper, wd-40, some other special electrical cleaner?), etc? is there a faq or sticky post that i'm