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 linen treatment composition consisting of:
• a hydroxycarboxylic acid, between about 1 wt. % to 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 5 wt. % and about 95 wt. %, a combination of about 6 wt-% to about 24 wt-% of sulfuric acid, and urea to form urea sulfate, and optionally one or more additives selected from a chelating agent, a dye, a perfume, an additional acid source, a hardening agent, 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 linen treatment composition is applied prior to washing said linen, after washing said linen, during washing of said linen, or multiple times throughout the method.