Soap Put in Garbage Cart/Bin Bar soap also goes in the garbage cart. A liquid soap bottle that is empty can be recycled without the pump (no need to rinse it if it’s empty). Ways to Reduce Refill Liquid Soap Containers Instead of buying one small liquid soap container each time you run out, buy liquid soap in bulk and refill empty soap containers. Ridiculously Easy Homemade Liquid Soap Making your own soap is much cheaper, less toxic and more environmentally friendly than buying liquid soap. You need only two ingredients — concentrated castile soap and a small bottle of essential oils. Find out more. Did You Know? Liquid vs. Bar Soap: Which Is Greener? Liquid soaps require more energy to produce, and consumers use six times more liquid soap than bar soap each time they wash their hands. However, bar soap has a more significant impact on land use, since its ingredients are produced by farmed crops. People also use more water when washing their hands with bar soap than with liquid soap, so the jury’s still out on this one.