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Hi yall, the murphys oil soap has the oleic acid in it, I think there are other soaps out there too that have the oleic acid. I heard that when your solution gets “old” just recharge with the ammonia, doesnt matter what color it has become it will still work. I first tried this a month ago and it did bring my solution back to life. I mix what Bob cooked up for clocks and use a ultrasonic, using a phosphate free TSP from Menards, oleic acid, as powerful ammonia as I can find….. I recently cut out the acetone thinking that was making it too strong for lacquered plates, (not sure if that really is helping, maybe a little) and of coarse water….I rinse in the hot water, have used either isopropyl alcohol or denatured alcohol (seems to me the denatured is more “oily” if that would describe it right than the isopropyl) otherwise not sure what would be best and then dry in a dryer box I built….have a great day, William