Do you find your bar of soap in the bathroom gets to a small size and then you throw it out. I unfortunately have known quit a few people who do.

Well, why not use it to make up your own liquid hand wash....

***Taking an empty bottle of liquid hand wash (save on the recycling)
***Chop up the leftover soap into small pieces (just small enough so it can fit through the top)
***Fill with water and add some disinfectant (detox or similar), this will provide you with an antibacterial wash.

Every now and then give it a shake and the soap will slowly dissolve, so when the liquid goes down you can refill and this will keep you going for a couple of months.