You should never pour grease, cooking oils, coffee grounds, eggshells, flour, paint, harsh chemical mixtures, or large amounts of harsh caustic acids down any household drain. Fats, oils, and grease congeal inside cold pipes to form rock-hard blockages, while starchy foods expand when wet. Furthermore, never mix bleach with ammonia or acidic cleaners, as this releases toxic gases. Callout type="warning" title="Hygiene Warning": Avoid mixing chemical drain cleaners, as violent reactions can splatter caustic liquid. Verification: Dispose of cooking grease in a sealed container in the trash rather than your plumbing system.
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