Rust stains need a different approach from many food or body stains. Iron can react badly with chlorine bleach and make discoloration worse, so identify the fabric, use a laundry-safe rust remover when appropriate, and rinse thoroughly before washing.
Do not start with chlorine bleach
Hypochlorite bleach can intensify some iron stains. If you are unsure what caused the mark, do not mix products and check the fabric care label before applying a specialized treatment.
Use a rust remover labeled for fabrics
Rust removers can be acidic, and not every formula is safe for every fiber. Follow the product directions for amount, contact time, and rinsing, and wear gloves when the label calls for them.
Rinse completely before adding other products
Do not combine rust remover with bleach, ammonia, or other cleaners. Rinse the treated area thoroughly, then wash with detergent according to the garment care label.
Investigate the source if stains keep returning
If several garments develop brown spots, iron in the water, corrosion in part of the washer, or contact with rusty metal may be involved. Fixing the source prevents repeated treatments that can wear fabric.
Sources
- American Cleaning Institute — Laundry Basics — Laundry practices covering sorting, loading, detergent dosing, and care-label guidance.