I need some advice on my soaps. I made a soap on a rope and I gave one to my sister and she said it made a whole bunch of scum in the bathtub. I use Brambleberry's goat's milk melt and pour soap, i tsp of cator oil per lb. for bubbles, 1 tsp per lb steric acid and 1 tsp per pound vanilla stablizer. I use this for my oatmeal, milk and honey fragrance so the soap doesn't turn yeloow. Any suggestions? Thanks, Mary.