How to Clear Hair Buildup Before a Lab Test

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Skip heavy conditioners and styling products for a few days before your test, since residue can cling to hair and skew results. On the day, give your scalp a thorough wash with a clarifying shampoo, focusing on the roots and massaging well. Rinse extra long, then follow with a light conditioner only on the ends. If you use dry shampoo, gels, or waxes, stop at least 24 hours beforehand. Avoid oils, serums, or leave-ins that coat the strand. A quick apple cider vinegar rinse can help strip stubbo…