Sounds like the time I bought my wife her own tool set for household use. While I was at work, she decided the stand mixer needed a good internal cleaning.
Unfortunately, she was probably right. Quite a few small appliances, even when cleaned to anal retentive housewife standards, get disturbingly filthy inside over a year or two. IIRC, some of them had/have a gearbox that can be removed intact, then properly cleaned and relubed by whatever method.
Of course, now, the industry solution is to build them to wear out within a couple of years. OTOH, we're still using the electric carving knife grandma bought in the 1970s. I need to go fish her 1960s vintage can opener out of storage too, as I've gone through two "modern" electrics, four manual wheel-type ones, and my P-51 is starting to bend.