That feeling that your shampoo has suddenly stopped doing its job is actually caused by product buildup.
Some shampoos are not going to remove as much of that kind of accumulated hair product as other shampoos will.
Not all shampoos effectively remove hair product, and some shampoos actually have product-like components in them.
Experts recommend starting with a clarifying shampoo to tackle the issue of weighed down and greasy hair.
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