I borrowed a tractor with backhoe once. Used 30 minutes, washed and returned. I'll never borrow again, unless he's operating. He borrowed my tractor, same time. I gave instructions on running, specfically the 3ph, as there is an issue if raised to max. It whines as pump is struggling to keep lifting. I showed him what it sounded like etc. Even put marks on panel for max height. Got it back and 3ph was all the way up and whining. He didn't hear it. Not sure that was the start of pump issues, but...
Borrowed another friends wood splitter, washed and changed oil. Next time I washed and changed hydraulic filter. I'll buy a new splitter for me next time.