The answer is pH-balanced shampoo. It's formulated mild enough to avoid stripping haircolor from the hair too fast.
pH-balanced shampoos are also called acid-balanced, since they're formulated to match the natural pH of hair and skin using ingredients like citric or lactic acid. Clarifying shampoo does the opposite job on purpose — it's built to strip buildup — which makes it a tempting but wrong answer here.
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