@Tammy321 I even have a basket of toiletry items guests leave behind in the bathroom for other guests to use if needed. I find guests often choose not to pack a lot of these items if they are headed home. So they have left almost full containers of shaving foam, sunscreen, shampoo, bath gel, etc. If it's just a quarter full, or the dregs, I'll use it myself, or offer to family or friends, because I hate waste. I wouldn't leave anything like a roll-on deodorant or anything people touch to their bodies, but something with a squeeze or pump lid or a spray wouldn't put me off if I were a guest.
I point out the basket, which has an ever-revolving selection, to guests, letting them know it's all been sterilized (I wipe everything down with anti-bacterial wipes), and to help themselves to whatever they want and I do notice that lots of them have made use of that stuff. I'm sure there are some people who are squeamish about using things others have, but plenty are grateful that it's available.