After thinking about it, my long handled Stihl was new in 1999 and I've never cleaned it that I remember. I do remember sharpening it a couple of times. It just gets some bar lube run on it before use every few years when it gets used. I'm sure I've never cleaned the little Stihl battery powered one and it gets the same lube. So in short, I don't think I've ever cleaned one since those are the only two I own.