Oxalic Acid can be Corrosive to Structural Metal Decking Hardware Too!

“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…