Sorry didn't see this till now. No clay or charcoal needed.
Technically, you don't need any of the above for a mechanic's/gardener's soap. The goal is to remove the grease, dirt, filth, or other bits and pieces.
Pumice helps by abrasion, but can be a little too good at that. I prefer soaps without abrasives as my gardening involves plenty of abrasions to my hands already. I find I don't have much of my top skin layer left if the soap is too scrubby.
For my gardener's soap, I make a coffee soap. I use my regular recipe, throw a few tablespoons of coffee grounds in the lye water, and add tea tree and lavender EOs. I made that on a whim one day, and my aunt loves it for after she gardens - she says it really helps because she would get small cuts that would become infected and if she washes her hands with this she doesn't. So it's become my gardener's soap.
IMO, gardener's soap and mechanic's soap would be two different things.
To make a "mechanic or garden soap" don't you want a little abrasion in there?? And what exactly makes it a mechanic soap?? Also, do you also cure these for a min of 30 days??
I see you've already made your soap, but I have a suggestion for next time or for anyone else that may want to try. I feel that gardener's soap and mechanics soap have two different goals and therefore are going to be two different soaps (just my opinion, not judging anyone else's). I see a mechanics soap more as a grease cutter and a gardener's soap more as a power scrubber. I just recently made what I would consider more of a mechanic's soap using a technique I modified from Soaping 101. Ms. Cathy made scrubs using both liquid and cream soaps. I switched out the sugar for both fine pumice and ground walnut shells and added in a little Orange EO for the "authentic" smell and for the grease cutting. Since then, I've been researching a better grease cutter and came across d'Limonene. It's not too expensive and is all natural if you're into that kind of thing. You can even get it on Amazon.
ETA link to video: https://www.youtube.com/watch?v=zAu7sUjUoB4 and correct spelling.
I make a kitchen soap with coffee and grounds. I have a couple customers that use that for gardening as well. I suppose it's just what works/appeals to each person. My husband and co-workers prefer the pumice for greasy hands.
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For the pumice, add just enough water to smooth out the lumps. I generally make it like a thick pudding.
I was FINALLY able to unmold the bentonite clay batch (round). It took 4 days due to the high amount of water I had to add to hydrate the clay. They're still really spongy feeling. I also added sodium lactate to the lye water. I can only image how much longer it would have taken to unmold those without it. :crazy: The activated charcoal batch feels nice and firm so I'll probably start testing those next week just for fun.
No problem with cracking either, haystack? That's my biggest concern especially with bentonite. I had a batch crack and warp when I didn't hydrate it first.
I use already brewed coffee grounds from the triple strength coffee I make for the liquid and just add it to my traced batter. I use about 1T ppo.
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