Sustainable laundry sour compositions with iron control

A method for treating linen, to reduce or eliminate iron deposition/redeposition comprising:

• washing the linen with a detergent at an alkaline pH in a washing machine;
• rinsing said linen;
• obtaining a liquid linen treatment composition consisting of:
• about 15 wt. % to about 45 wt. % of a hydroxycarboxylic acid which is selected from one or more of:
• glycolic acid, malic acid, lactic acid, tartaric acid, citric acid, hydroxybutyric acid, glyceric acid, tartronic acid, salicylic acid, m-hydroxybenzoic acid, p-hydroxybenzoic acid, gallic acid, mandelic acid and gluconic acid;
• about 1 wt. 1% about 10 wt. % of a carboxylate polymer which is a polyacrylic acid salt, a polymaleic acid salt, or a combination thereof;
• water in the amount of between about 15 wt. % and about 45 wt. %;
• about 12 wt. % to about 21 wt. % of sulfuric acid form urea sulfate;
• and optionally one or more additives selected from a chelating agent, a dye, a perfume, an additional acid source, a surfactant and/or a defoamer;
• applying the linen treatment composition or a use solution of said linen treatment composition to said linen;
• wherein the use solution of the linen treatment composition has a pH of between about 3 and about 10;
• and
• reducing or eliminating iron deposition or redeposition on said linen,
• wherein the linen treatment composition is free of a peroxycarboxylic acid and is applied prior to washing said linen, after washing said linen, during washing of said linen, or multiple times throughout the method.