Yes, it is generally safe to pour regular household bleach down a shower drain in moderate amounts to kill mold, eliminate foul mildew odors, and sanitize surface slime. However, bleach will not unclog a blocked drain because it lacks the chemical properties needed to dissolve human hair, grease, or mineral scale. Callout type="warning" title="Hygiene Warning": Never mix bleach with ammonia, vinegar, or acidic drain openers, as this creates toxic chlorine gas. Verification: Run fresh water down the drain after sanitizing to rinse away residual bleach odors.
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