Patent ID: 8906819

Claim:
A method for removing calcium fly ash material from a substrate, comprising: providing a substrate containing the calcium fly ash material, wherein the calcium fly ash material contains at least 10 wt % calcium oxide, based on total weight of the calcium fly ash material; and treating the provided substrate with a treatment composition to remove at least a portion of the calcium fly ash material from the substrate, wherein the treatment composition is comprised of at least 1 wt % partially protonated polycarboxylic acid, wherein i) the polycarboxylic acid is selected from the group consisting of dicarboxylic acid, tricarboxylic acid, tetracarboxylic acid, and combinations thereof, ii) the partially protonated polycarboxylic acid is a polycarboxylic acid having at least one protonated carboxyl group and at least one non-protonated carboxyl group, and iii) the at least one non-protonated group of the polycarboxylic acid includes a salt component selected from the group consisting of an alkali metal, ammonia and organic amine.