Black Composite Decking Material - Redwood decks are beautiful and durable as long as they are properly cared for. A decade ago, we can purchase Redwood for a tune, but now it is rather expensive so if you own Redwood decks, then you may want to take decent care of those. The idea about any outside decking material would be to protect it from the elements so the wood doesn't sustain damage. If water gets under the surface of decking material, it can cause cracks. These cracks are a part of the natural breakdown process of wood, but it is not a good thing.
There are many good quality spots that act as sealants to reduce moisture from breaking down wood fibers. Local climates decide the length of time your decks may go before the next sealant application. I dwell in severe cold and snow. The summers are quite gentle so the wood surfaces do not sustain much damage from heat or sunlight, but the rain and snow really wreak havoc on softwood substances.
I try to wash and apply sealant to my decks each other year. I know of some sealants that assert to last up to five decades, but I wouldn't let any decks go longer than three years without some other application. The first part of the course of action is to wash out the old stain off the decks. You'll also want to spot treat anything such as paint or oil stains. You may spot clean them with bathtub stain remover or bathtub cleaner from its concentrated form.
When the spot treatment is done you will want to get the deck moist using a garden hose to allow the surface become porous and much more open to the cleaner. Pour a good amount of cleaner on the deck and then sweep it vigorously with a stiff brush to wash away the upper layer of deteriorated wood.