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