There is black 'stuff' on my deck that sort of follows the wood grain line. Could this be mold
l have used the Armor Deck Cleaner on it, and it did not wash off.It can be
scrubbed off.But it is on MUCH [but not all] of my 400 sq ft deck and the
steps.What can l do about this? l am repainting the deck tomorrow so l
have to have it all clean today so it will be dry tomorrow.It was just
painted 2 years ago but l am wondering if the man who did it made sure it
was completely dry.He used a very expensive deck paint that was supposed
to last 5 years, and the employee at Sherwin Williams said he'd never seen that paint fail before now. Yeah, l hate setting those kinds of records...
First, a question for YOU. if the guy who did it said it would
last for five years, why isn't HE refinishing the deck?
Anyway. mix up a 1 c. water, 1/4 c. laundry bleach & 2 tablespoons dish
detergent. scrub this solution into some of the black spots (don't be
stingy!) & let it sit for ~ 15 minutes, then rinse.
If it is mold or mildew, the stain will come off or at least really, REALLY lighten. And here is the ''rest of the story'' from an answer I previously posted: ..Clean the deck THOROUGHLY. use a liquid laundry detergent (it has non-bleach additives that will clean the wood better than just soap & water) solution of one cup laundry detergent to one gallon of warm water. Broom the solution onto the deck wood, let sit for 10-15 minutes & then rinse, rinse, rinse. Try to do the cleaning early in the day when the deck is in shade. ..If there are any mold/mildew stains, treat them w/ a 1:4 bleach:water solution after cleaning the rest of the deck area per above instruction. If this doesn't work, use a TSP (trisodium phosphate) solution of one cup TSP, one cup household bleach & one gallon water. Broom solution onto deck, wait 15-30 minutes, then ''scrub'' rinse the solution off with a broom. ..Then let the wood dry. ..I can not stress the rinsing/drying too much. applying ANYthing over detergenty and/or damp wood will reduce it is staying power by about. oh, say 917%. ..To refinish the deck, decide if a wood stain or paint is preferred. ..If the wood isn't terrific, paint it. Use an exterior paint made for decks, or a marine grade deck paint. For safety is sake, consider adding an anti-slip agent to the paint. Paints will typically require at least two coats. ..If the deck is made of good-to-great grained wood, a penetrating stain is usually preferable; you can choose a natural wood stain or a colored stain. You can get away w/ one coat of stain, but it will last longer & look tons better if you use two coats. ..No matter what you choose for the deck is finish, it MUST have the following three characteristics, else you're gonna be doing this job EVERY year: ....1. The stain/paint has to be ''water repellent'' or ''water proof,'' not just ''water resistant.'' ....2. The stain/paint has to have UV (ultraviolet) protection. ....3. The paint/stain should contain a mildewicide. If it doesn't, you can buy a mildewicide separately & add it to the stain/paint. (If there is trees/shrubbery overhanging the deck, consider cutting it back to avoid water dripping onto the deck while also allowing sun to get to the deck.) ..Do allllllllllllllll of this & the deck should be good to go for at least three years, & upwards of five. Hope this helps. TX Griff
use something else.
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