Meh, I bought this keyboard back in the nineties, used, on eBay, back when it was possible to use eBay without using a credit card or PayPal. It's a model M. They last a long time. I could take it apart and clean it, but so far I've never bothered. Maybe someday if I get incredibly bored I will. Meanwhile, if a key starts giving me trouble, I just take a half-unbent paperclip or something and fish a few cubic inches of matted hair and whatnot out from under that key, and then it works again. Problem solved.