Talking of garlic nets, here is a wee trick to use up every last bit of soap bars. Put the last slivers of the soap bars into a garlic net which has been opened at one end. To use, just rub the net between your hands.
The net not only allows the soap out, but also stops it from becoming mushy, as air is able to circulate.
Soap is cheap, so it won't save you a fortune, but it means zero waste.
I can't claim this as my idea. It is a modern implementation of an old concept. "Soap savers" were popular from the mid-19th century onwards. My grannie had an old soap saver basket, which dated from the 1930s. She used it when hand-washing clothes.