Yes—white vinegar can help reduce detergent residue and mineral buildup, which may make towels feel softer, but it isn’t a magic whitening agent. Used incorrectly, it can also damage some materials or appliances.
The right way to use vinegar in laundry
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For towels: Add about ½ cup (120 mL) of plain white distilled vinegar to the washing machine’s fabric-softener dispenser during the rinse cycle. Don’t pour it directly onto dry clothing.
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For whites: Use your normal detergent and wash according to the care label. Vinegar can help remove some odors and residue, but oxygen bleach is generally more effective for whitening.
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Don’t mix vinegar with chlorine bleach. The combination can release dangerous chlorine gas.
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Don’t use vinegar with every load if your washing-machine manufacturer advises against it, because repeated exposure to acid may affect rubber seals and other components.
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Avoid vinegar on delicate or acid-sensitive fabrics, including some elastane/spandex garments.
For particularly stiff towels, an occasional hot wash with the appropriate amount of detergent followed by a vinegar rinse can help remove buildup. Avoid using excessive detergent, since residue itself can make towels feel rough.
If you want, I can also give you a simple 2-wash method for turning stiff, dingy towels soft and bright again.
