“Oxalic acid” based products, known as “deck brighteners”, commonly recommended by composite manufacturers to “remove rust” and/or “tannin stains”, in addition to “mold and mildew”, should ring a bell? They have chosen to recommend this acid based chemical even though at least one chemical manufacturer of an oxalic acid-based product states on its label directions “states DO…
Composite Deck Cleaner
How to clean Trex®, TimberTech®, Fiberon®, ChoiceDek®, etc. of stains caused by mold & mildew, black spots, green slime, sap, grease, oil, barbecue, tannin, leaf, pine needle, chalk, berries, blood, sunscreen, olive oil, citronella candle oil, peanut butter, red wine, pet food & waste, hard water, grass, ground in dirt, clay, brick, flower pot, rust, grime, & most other stains that are deep set or below the surface & can deeply root or saturate into the porous surfaces of most early generation uncapped composites made from exposed wood & plastic generally manufactured till around 2015 +/- depending on the manufacturer.
NO CHLORINE BLEACH!
& SAFETY ISSUES
excessive color bleaching,
exacerbated rapidly returning molds &
corrosion to structural metal decking hardware.