The stuff sold as "Tincture of green soap"? After reading up on it, I see it's a medical grade soap. Do you use it in a spray bottle? Or better, could you tell us how you use it, dilution rates, application time, how long it lasts, etc?
I mix a spay bottle at a time and go through the bottle in about 2 weeks.
I do a 1:10 ratio to tap water.
Wipe on and wipe off just like any other soaps.