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