Patent ID: 7517844

Claim:
A composition comprising a mixing product of: (i) a first acid having a pKa of less than 3, in an amount by weight of 1-10%, (ii) a second acid having a pKa of greater than 3, in an amount by weight of 1-10%, (iii) a nonionic surfactant in an amount by weight of 1-7% comprising compounds of formula I: CH 3 (CH 2 ) m —(O—CH 2 —CH 2 ) n —OH wherein m is an integer of 8 to 10, and n represents an average degree of ethoxylation for the mixture of 1-15; and (iv) water; wherein the composition has a pH of less than 2.5, and wherein the composition further comprises a 1:1:1 mixture by weight of ethanol, dipropylene glycol monobutyl ether, and propylene glycol n-butyl ether.