The rule is and it doesn't apply only to my hair stuff, if you want something ask me. If you use it up, replace it or hell tell me you used it up. Though my mom and I don't have that issue. She used my coconut milk once to cook with and it was for my hair but she told me and it's my mom so I was like oh don't worry about it but she still bought me a few cans to replace the one.
Anyone else would get cut to the white meat. It's just rude to take someone's stuff, not replace it ESPECIALLY if you know they aren't working!!! They don't have money to be shelling out because you took it upon your self to use up all of their stuff.
That is a pet peeve of mine. I have a family member that tends to help herself to my stuff so I got my SO to put a good lock on my bedroom door and my ish stays in here while I'm at work.
I'm a very giving and sharing person, but if you use up my ish, we gonna fight. Hell, I'll buy you your own before you use up mine.