Surface disinfectant concentrate comprising a. a quaternary ammonium compound, b. at least one alkylamine of the general formula I and/or II in which R is a straight or branched alkyl or alkylene chain having 6 to 22 carbon atoms, n and m are a value from 3 to 12 and p is a value from 2 to 12, c. auxiliaries comprising c.1 at least one dispersant, c.2 at least one corrosion inhibitor consisting of a mixture of 95-100% by weight of 2-ethylhexyl phosphate and 0-5% by weight of phosphoric acid, the constituents of the mixture adding up to 100% by weight, c.3 at least one defoamer, c.4 at least one pH modifier selected from formic acid, acetic acid, propionic acid, citric acid, malic acid, tartaric acid or hydrates and salts thereof, and c.5 optionally further auxiliaries, and d. water, where the concentrate contains at least the components a, b, c.1, c.2, c.3, c.4 and d and where the dispersant is a polyaminomethylenephosphonate derivative according to the general formula where "n" is > 2; where M is a hydrogen or a suitable cation, such as an alkali metal or ammonium; where each group R, identically or differently, is independently selected from: 1. -CH 2 PO 3 M 2; 2. -CH 2 R 1 with R 1 selected from -CH 2 OH, -CHOHCH 3, - CHOHCH 2 Cl, -CHOHCH 2 OH; 3. -(CH 2) m SO 3 M, where m is 3 or 4; 4. -CH 2 CH 2 R 2 with R 2 as -CONH 2, -CHO, -COOR 3, -COOX or CN, where R 3 is either -CH 3 or -C 2 H 5 and X is a cation selected from M. a. a quaternary ammonium compound, b. at least one alkylamine of the general formula I and/or II in which R is a straight or branched alkyl or alkylene chain having 6 to 22 carbon atoms, n and m are a value from 3 to 12 and p is a value from 2 to 12, c. auxiliaries comprising c.1 at least one dispersant, c.2 at least one corrosion inhibitor consisting of a mixture of 95-100% by weight of 2-ethylhexyl phosphate and 0-5% by weight of phosphoric acid, the constituents of the mixture adding up to 100% by weight, c.3 at least one defoamer, c.4 at least one pH modifier selected from formic acid, acetic acid, propionic acid, citric acid, malic acid, tartaric acid or hydrates and salts thereof, and c.5 optionally further auxiliaries, and c.1 at least one dispersant, c.2 at least one corrosion inhibitor consisting of a mixture of 95-100% by weight of 2-ethylhexyl phosphate and 0-5% by weight of phosphoric acid, the constituents of the mixture adding up to 100% by weight, c.3 at least one defoamer, c.4 at least one pH modifier selected from formic acid, acetic acid, propionic acid, citric acid, malic acid, tartaric acid or hydrates and salts thereof, and c.5 optionally further auxiliaries, and d. water, where the concentrate contains at least the components a, b, c.1, c.2, c.3, c.4 and d and where the dispersant is a polyaminomethylenephosphonate derivative according to the general formula where "n" is > 2; where M is a hydrogen or a suitable cation, such as an alkali metal or ammonium; where each group R, identically or differently, is independently selected from: 1. -CH 2 PO 3 M 2; 2. -CH 2 R 1 with R 1 selected from -CH 2 OH, -CHOHCH 3, - CHOHCH 2 Cl, -CHOHCH 2 OH; 3. -(CH 2) m SO 3 M, where m is 3 or 4; 4. -CH 2 CH 2 R 2 with R 2 as -CONH 2, -CHO, -COOR 3, -COOX or CN, where R 3 is either -CH 3 or -C 2 H 5 and X is a cation selected from M. where the concentrate contains at least the components a, b, c.1, c.2, c.3, c.4 and d and where the dispersant is a polyaminomethylenephosphonate derivative according to the general formula where "n" is > 2; where M is a hydrogen or a suitable cation, such as an alkali metal or ammonium; where each group R, identically or differently, is independently selected from: 1. -CH 2 PO 3 M 2; 2. -CH 2 R 1 with R 1 selected from -CH 2 OH, -CHOHCH 3, - CHOHCH 2 Cl, -CHOHCH 2 OH; 3. -(CH 2) m SO 3 M, where m is 3 or 4; 4. -CH 2 CH 2 R 2 with R 2 as -CONH 2, -CHO, -COOR 3, -COOX or CN, where R 3 is either -CH 3 or -C 2 H 5 and X is a cation selected from M. where "n" is > 2; where M is a hydrogen or a suitable cation, such as an alkali metal or ammonium; where each group R, identically or differently, is independently selected from: 1. -CH 2 PO 3 M 2; 2. -CH 2 R 1 with R 1 selected from -CH 2 OH, -CHOHCH 3, - CHOHCH 2 Cl, -CHOHCH 2 OH; 3. -(CH 2) m SO 3 M, where m is 3 or 4; 4. -CH 2 CH 2 R 2 with R 2 as -CONH 2, -CHO, -COOR 3, -COOX or CN, where R 3 is either -CH 3 or -C 2 H 5 and X is a cation selected from M. 1. -CH 2 PO 3 M 2; 2. -CH 2 R 1 with R 1 selected from -CH 2 OH, -CHOHCH 3, - CHOHCH 2 Cl, -CHOHCH 2 OH; 3. -(CH 2) m SO 3 M, where m is 3 or 4; 4. -CH 2 CH 2 R 2 with R 2 as -CONH 2, -CHO, -COOR 3, -COOX or CN, where R 3 is either -CH 3 or -C 2 H 5 and X is a cation selected from M.