Whenever I borrow something, which is rare, I return it in better condition than that in which it was received. I borrowed my neighbors leaf blower the other day. Before I returned it, I filled it with fuel, cleaned the air filter, and wiped the whole unit down with silicone polish so that it looks like new. They will likely never notice, but this is the way I prefer to treat others. Trouble is, I can't really expect those who borrow from me to have the same attitude.... but I kinda do. I don't lend pressure washers, chain saws, firearms, tractors, vehicles, atvs or any such thing. I'll be glad to help though in any way I can.
ETA: I don't think people intend to tear things up; it's just that the average person is rather ignorant when it comes to operating power equipment, how it works, and how to protect and care for it properly. If my very expensive, prized whatever is damaged by a clueless friend or neighbor trying to save a buck by borrowing, well, shame on me for letting it happen cause I should have predicted it.
