That is the one thing that does work on rust on clothes,putting salt on then lemon then placed where the sunlight can get at it.
I tried this myself awhile back and it really did work..
Any of the methods given below are safe for rust stains on white fabrics, but test on colored fabrics before use.
Lemon Juice - suitable for light stains on delicate fabrics. Spread stain over a bowl of boiling water and sprinkle with lemon juice. After a few minutes, rinse well and repeat if necessary.
Lemon Juice and Salt - sprinkle stain with salt, rub with lemon juice and place in sunlight. Keep moist with lemon juice till stain goes. Rinse well.
Cream of Tartar - (a powder, available in your grocery store spice section) for extensive staining, boil in a solution of 3 tsp. cream of tartar per cup of water. Rinse well OR if less extensive, dampen stain, spread with cream of tartar, hold in steam from boiling kettle. Rinse immediately stain goes. Do not use on fabrics that cannot be washed in hot water.
Hope this helps!
Try dabbing a little bit of hydrogen peroxide (from the medicine cabinet) on the stain with a Q-tip. Let set for just a few minutes, then wash.
You could try some of "the works" toilet bowl cleaner. I got a rust stain out of a shirt that way,,,Good luck..Wendy
Sprinkle the stain with salt, drip some lemon juice on it and set it in the sun.
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