How to Clear Hair Buildup Before a Lab Test

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If you're prepping for a lab test where hair strands are collected, skipping your regular conditioner for a couple days helps. Right before the test, just rinse with warm water and use a gentle, clarifying shampoo once to strip any leftover gel, oil, or product gunk. Avoid heavy conditioners or serums after—letting your hair air-dry clean and product-free ensures the sample is accurate and free from external residues that could skew results.