The glycerol is about 3/4 "soap" and 1/4 reclaimable methanol. I distill the methanol (for reuse) from the glycerin and give the de-methed soap by-product to shade-tree mechanic shops as degreasers, to the restaurants I get my raw oil from as soaps and degreasers, and I make bar and liquid soaps for my personal use once in a while, giving some of it away if my friends and family ask.
Also, the wastewater treatment plant uses some of the de-methed excess as a stimulant(?) food for the digesters, don't know exactly their use but they take it.
The de-methed glycerol makes good soap, works well as a leather conditioner provided no methanol remains, is a great degreaser, parts cleaner, auto wash, tire cleaner, pressure washer solution, weed killer, animal feed sticker, and several other uses ie. dust control for unpaved surfaces, and as a nutrient source for compost bins/piles. You know those little sponge things they sell to "polish" shoes? Glycerin on/in a sponge? This will do the same thing for free.
The uses are as varied as the need, but the biggest problem is matching the need with the by-product, but since it's "free" and I live in a rural agricultural setting, it's not too difficult to get rid of the bulk of it - properly.
Which washing method do you use?
huh. clever.