Storm System All Surface Cleaner is concentrated product for cleaning exterior, natural wood surfaces; including cedar, redwood, pressure treated, pine and oak fencing, decks and siding. It can also be used on concrete, masonry, vinyl siding and more. This product provides excellent results and does not contain chlorinated solvents, acids or any ozone depleting ingredients. Use All Surface Cleaner in place of ineffective bleach products or hazardous solvent based compounds. It is a proven cleaner for gray and discolored substrates with stains caused by moisture, mold, mildew, tannin, U.V damage, dirt, natural weathering and aging.