There are mainly 2 types of shampoo bars normal bars or natural bars. If you switch to natural (sulphates and parabin free) your hair will go through a transition stage where the hair will become waxy. This is build up of previous products. It can takes about 8 weeks to clear. Natural shampoo doesn't strip the hair like normal does. The old product has to clear from the hair by itself, things like vinegar rise help with this
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