Hello All,
This is my first Permies reply. Love this forum. The key may be to look at the superfat level in the soap recipe. Superfat is the amount of fat that remains in the soap once all the lye is converted. If there is a lot of lard left in your soap I would suspect it won't leave a clean finish. The Brambleberry lye converter
online includes the superfat level. Set it to be 0 to get a recipe for the amount of amount of lye to add to any fat you have to get a clean cutting soap recipe. If you use
wood ash you will get inconsistent results as the amount of lye varies. If you have lye leftover in your soap it can irritate skin.
I use my homemade barsoap on my dishes and it cuts grease like a charm. I usually save the center that starts getting squishy at the end in a little ramekin, pour
hot water just to cover and it makes a gel. I keep a little dish brush in it that is always ready to go for pots and pans.