Why: An additive that absorbs water to melt ice, it's nontoxic if ingested and won't irritate skin. But use sparingly; in runoff, it can lower oxygen levels in waterways, potentially harming aquatic life.
Product picks: Safe Paw Ice Melter deices and curbs refreezing for up to three days (about $25; safepaw.com). Safe-T-Pet combines propylene glycol and urea for a pet-safe mix that's kinder to plants, too (about $12; mortonsalt.com).
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