What to do with soap slivers?

You need to melt it down on the stove.

equal parts water to soap.

Start by getting a cup of water boiling, then reduce the heat to medium. Add the cup of soap gradually, about a quarter cup at a time. Stir as you go, until all soap is dissolved. Add a little extra water if you need to to keep it from burning. The mixture should end up thick, and with a texture like mashed potatoes. Take off the heat and mix in a little olive oil - about a tablespoonful. Divide into moulds and pop in the freezer.

Well you can put them all in a jar of water and wait till they go all mushy. Pour the liquid into a bar shaped container, place somewhere to let the bars dry out. This will take weeks if not months by the time you collect enough slivers and carry out the process.

Much easier to attach the sliver to the next bar. This is easily cone if you place the damp new bar on the damp sliver and leave for a day or so.

Better still, use body wash. No problem with left over soap, does not have soap scum build up and is generally less expensive.

My wife saves the pieces in a jar of water and uses the liquid soap for first washing dirty hands before using hand soap for the second washing, and I think that it is a great way of saving soap and washing hands clean.