Is there any way to recycle the leftover soap?

I only know these two ways: save up the remaining soap heads, until you have a few or twenty (the number is up to you), boil some water in a pot, and boil the rest. Put it in a pot and boil it until it becomes a lump. Alternatively, find a silk sock, put all the remaining soap inside the sock, and tie the sock tightly. This can also be used.