Can you use Murphy’s oil soap on composite decking?

Can you use Murphy’s oil soap on composite decking?

This is generally discouraged, and it’s worth being cautious here. Murphy’s Oil Soap is formulated primarily for wood surfaces, and while composite decking contains wood fibers, its outer coating is designed to be non-porous and doesn’t absorb or benefit from oil-based cleaners the way real wood does. Using it on composite can leave an oily residue or film on the surface, which may actually attract more dirt over time and create a slicker, potentially less safe walking surface when wet. Most composite manufacturers, including major brands, specifically recommend mild dish soap and water instead, which cleans effectively without leaving residue behind. If you’ve already used Murphy’s Oil Soap on a composite deck, a thorough rinse and a follow-up wash with plain dish soap will help remove any leftover film.