Recycling bar soap
Many people don't use bar soap anymore, but I do use it to wash make-up off before I actually use any type of facial cleanser. And when cash is low and so is our liquid soap I resort to pulling out a bar of soap as well. So- if you mostly use hand soap, but have that random bar of soap around your house, use it up and when it gets down to that little useless sliver or starts falling apart in chunks from being wet, break it up and add it to your liquid hand soap container. I often do this with a little water and then add some additional liquid soap- it lasts forever and eventually mixes in with the liquid soap! It's a great way to not waste that last little bit of soap and also extend the use of your liquid soap!