A masonry treatment composition comprising a fluorine-containing polymer comprising repeating units derived from: (a) a fluorine-containing monomer having a fluoroalkyl group represented by the general formula: CH 2 =C(-X)-C(=O)-Y-Z-Rf wherein X is H, linear or branched C 1-21 -alkyl, F, Cl, Br, I, -CFX 1 X 2 (wherein X 1 and X 2 are H, F, Cl, Br or I), cyano, linear or branched C 1-21 -fluoroalkyl, optionally substituted benzyl, or optionally substituted phenyl; Y is -O- or -NH-; Z is a C1 - 10-aliphatic group, a C 6-10 -aromatic or-cycloaliphatic group, -CH 2 CH 2 N(R 1) SO 2 - wherein R 1 is C 1-4 -alkyl, -CH 2 CH(OZ 1)CH 2 - wherein Z 1 is H or acetyl, or -(CH 2) m -SO 2 -(CH 2) n - or -(CH 2) m -S-(CH 2) n -wherein m is 1-10 and n is 0-10, and Rf is a linear or branched C 1-6 -perfluoroalkyl, (b) a first hydrophilic monomer of the formula: CH 2 =CX 11 C(=O) -O-RO-X 12 wherein X 11 is H or methyl, X 12 is H or a saturated or unsaturated C 1-22 -hydrocarbon group, and R is C 2 - 6 -alkylene, (c) a second hydrophilic monomer of the formula: CH 2= CX 21 C(=O)-O- n -X 22 or CH 2 =CX 31 C(=O)-O- n - C(=O) CX 32 =CH 2 wherein X 21, X 31 and X 32 each independently is H or methyl, X 22 is H or a saturated or unsaturated C 1-22 -hydrocarbon group,R is C 2-6 -alkylene, and n is an integer of 2-90, and (d) a monomer having an anion-donating group and an ethylenically unsaturated double bond which is (meth)acrylic acid, wherein the fluorine-containing polymer comprises 45-76 wt.-% of monomer (a), 5-25 wt.-% of monomer (b), 3-30 wt.-% of monomer (c) and 6-25 wt.-% of monomer (d), based on 100 wt.-% of the total of monomers (a)-(d), and has a weight-average molecular weight of 30,000 to 110,000, as measured by GPC in terms of polystyrene. (a) a fluorine-containing monomer having a fluoroalkyl group represented by the general formula: CH 2 =C(-X)-C(=O)-Y-Z-Rf wherein X is H, linear or branched C 1-21 -alkyl, F, Cl, Br, I, -CFX 1 X 2 (wherein X 1 and X 2 are H, F, Cl, Br or I), cyano, linear or branched C 1-21 -fluoroalkyl, optionally substituted benzyl, or optionally substituted phenyl; Y is -O- or -NH-; Z is a C1 - 10-aliphatic group, a C 6-10 -aromatic or-cycloaliphatic group, -CH 2 CH 2 N(R 1) SO 2 - wherein R 1 is C 1-4 -alkyl, -CH 2 CH(OZ 1)CH 2 - wherein Z 1 is H or acetyl, or -(CH 2) m -SO 2 -(CH 2) n - or -(CH 2) m -S-(CH 2) n -wherein m is 1-10 and n is 0-10, and Rf is a linear or branched C 1-6 -perfluoroalkyl, X is H, linear or branched C 1-21 -alkyl, F, Cl, Br, I, -CFX 1 X 2 (wherein X 1 and X 2 are H, F, Cl, Br or I), cyano, linear or branched C 1-21 -fluoroalkyl, optionally substituted benzyl, or optionally substituted phenyl; Y is -O- or -NH-; Z is a C1 - 10-aliphatic group, a C 6-10 -aromatic or-cycloaliphatic group, -CH 2 CH 2 N(R 1) SO 2 - wherein R 1 is C 1-4 -alkyl, -CH 2 CH(OZ 1)CH 2 - wherein Z 1 is H or acetyl, or -(CH 2) m -SO 2 -(CH 2) n - or -(CH 2) m -S-(CH 2) n -wherein m is 1-10 and n is 0-10, and Rf is a linear or branched C 1-6 -perfluoroalkyl, (b) a first hydrophilic monomer of the formula: CH 2 =CX 11 C(=O) -O-RO-X 12 wherein X 11 is H or methyl, X 12 is H or a saturated or unsaturated C 1-22 -hydrocarbon group, and R is C 2 - 6 -alkylene, (c) a second hydrophilic monomer of the formula: CH 2= CX 21 C(=O)-O- n -X 22 or CH 2 =CX 31 C(=O)-O- n - C(=O) CX 32 =CH 2 wherein X 21, X 31 and X 32 each independently is H or methyl, X 22 is H or a saturated or unsaturated C 1-22 -hydrocarbon group,R is C 2-6 -alkylene, and n is an integer of 2-90, and (d) a monomer having an anion-donating group and an ethylenically unsaturated double bond which is (meth)acrylic acid,