A method 13 wherein the aqueous acid solution contains about 0.01% to about 1.0% by {HEAD ~ weight} of {TAIL ~ the surfactant} based on the amount of acid 
A method 13 wherein the aqueous acid solution contains about 0.01 % to about 1.0 % by { HEAD ~ weight } of { TAIL ~ the surfactant } based on the amount of acid
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH