When I lend equipment to others, I make perfectly clear that I want it back in perfect condition. I won´t lend equipment to people who don´t respect that. So far people respected this. I think that it´s not asking too much, if you demand that people treat your equipment with respect. After all good equipment is expensive.<br>After I told my friend what it means to me if she doesn´t clean my equipment before she gives it back, she understood why she should clean it. I´m sure you could give her examples of things, that you do (or don´t do) because you respect her. That worked for me. Girlfriends don´t come with a manual, so I can´t give you a guarantee that it´ll work with yours. ;-)