It looked sort … Mildew is easily dealt with by using a pressure sprayer and applying a … Good maintenance practices for cedar decks include allowing proper water drainage; keeping the surface free of dirt, leaves, pine-needles and other debris; and moving planters, benches and other deck accessories from time to time to permit the deck beneath them to dry thoroughly. DECKS: MILDEW Two years ago I had a cedar deck built. Thankfully, cleaning usually removes mildew and mold stains. Wood can intentionally be stained black in the same way, and that's called… The black coloring or darkening of the cedar siding is caused by mold growth. Black spots on newly oiled Jarrah verandah. If your beautiful, unfinished cedar or other natural wood deck is looking more weathered than you would like or has moss, lichen, or other dirt on it, there's a quick and easy way to clean it without wasting money on harsh chemicals. If the deck is in a protected area that gets little sun, a fungus is the more likely culprit. After the hose went on the deck, it got black spots all over it. As mentioned before, redwood and cedar wood both contain tannin. Failure to remove mold from unprotected softwood decking is a surefire way of creating decay and rot issues. I used Cabots clear stain to preserve it. Looks like small pools of coffee got spilled on it. Removing Black Stains in Wood Furniture With Oxalic Acid: Iron oxide stains in wood are usually dark spots caused by prolonged exposure to water and / or metal. DO NOT USE A STIFF BRUSH! A deck that dries after wetting will last longer than one that stays damp. There are several reasons why black mold can grow. However, with semi-transparent stains, you will need to take care with the application. There are many products on the market that will take off the stain. I put new cedar down, cleaned, and then stained/treated with Olympic Maximum clear waterproof sealant. One method that is usually successful is to use a wood cleaning product. The customer wanted something different, 'rustic' looking, so I ordered mid-grade lumber (not heartwood) and let the deck weather a month or so before sealing with a clear acrylic polymer. It has large dark (nearly black) water spots ALL over it. It is common for decking timber and other exterior timbers such as cladding to generate black mould over time. The spots are about the size of the head of a pin and appear to be black or dark brown in color. It's black. How to Clean Unfinished Wood and Restore That Natural Smell . Our new (unstained) cedar deck has been in for 9 days now and it's already got several black spots (see close-up). Also known as artillery or cannonball fungus (Sphaerobolus), it uses internal water pressure to forcefully fire its spores (similar to seeds) up to 20 feet away.The fungus sets its sights on bright areas so that means it will aim for any pale surface that reflects light, such as the siding on your house. Cedar deck problems - Black Spots I had a cedar deck built last year and have had nothing but problems. Water stains are one of the hardest to remove from cedar wood. It looks awful! In addition , over time, Redwood will trun a grayish color because of Tannic Acid. In most circumstances, the mould is living on the surface of the timber, feeding on sap sugars and other extractives released by the wood over time. A common problem that homeowners have with cedar siding, however, is extractive bleeding or tannin staining. It's hard to see shotgun fungus itself because it’s only 2 millimeters wide. A deck that dries after wetting will last longer than one that stays damp. 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