Have you chelated recently, particularly if you live in a hard water area or swim regularly?
If not, try that. Some people recommend strong vinegar rinses or club soda rinses, but IMO the best is to simply get a chelating shampoo (often marketed as swimmer's shampoo) and use that occasionally. Weaker vinegar rinses (e.g. 1 teaspoon vinegar to 1 medium glass of water) after each wash work well for reducing mineral build-up, particularly of limescale.
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