The best product to fix a slow-flushing toilet caused by mineral scale buildup is a commercial non-toxic descaling toilet bowl cleaner or plain white vinegar combined with a wire brush. For slow drainage caused by partial organic restrictions, enzymatic septic cleaners or heavy-duty dish soap with warm water work exceptionally well. Avoid harsh acid-based chemical drain openers that can damage porcelain glazes and rubber wax rings. Verification: Check that rim jets and siphon holes are completely free of scale after cleaning.
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