Spring Valley 2063400 Professional Ice Melter is generally safe to use on composite decking, but it requires careful handling: Apply Lightly: Do not dump large piles in one spot. Rinse off Residue. Avoid Metal Tools: Never use a metal shovel, chipping tool, or wire brush to clear ice from your deck, as these will permanently scratch the composite surface. Use a plastic shovel or a stiff broom instead.