It depends on the issue with the deck. If it's simply dirt, debris and plant matter, decking can be cleaned by sweeping with a stiff bristle broom then treated with a dedicated decking cleaner. For decking that has been affected by mould and algae, sweep with a stiff broom or brush to remove as mush surface matter as possible then treat with a mould and mildew cleaner. heavily soiled decking may require a second treatment.
It depends on the type of wood and the finish you want to achieve. Have a look at the first in our series of three blog posts (Garden Decking Stain Treatments - Part #1) about garden decking treatments, how to prepare the wood beforehand and make a great job of it.
Black wood finishes on decking have become more popular as they provide a striking contrast against the green hues of grass, trees and other garden plants. Black wood finishes also help to keep the traditional look of exterior wooden beams, barns, doors and window frames. Read more about achieving the perfect black wood finish in our blog.
Algal growth is the most common cause of slippery decking and can be cleaned using a dedicated Mould and Mildew Cleaner. If the decking is bare wood, a wood preservative treatment should then be applied to help prevent future growth. Treating the decking with a decking oil once the preservative has fully dried will further protect the wood from biological growth and water penetration.
Slippery decking usually occurs when timber decking boards develop mould, algae or other biological growth, usually identifiable by green or black staining in the wood. This normally happens on bare wood decking that hasn't been treated or previously oiled decking that hasn't been maintained for a number of years.
Remove as much of the surface growth as possible with a stiff broom, brush or scraper. When done, treat the decking with a decking cleaner and one that is designed to kill off mould and algae spores in the wood. Heavily soiled decking may require a second treatment. Then apply an exterior wood preservative to help prevent future biological growth before applying a decking oil. For additional anti-slip properties, use a slip resistant decking oil such as Osmo Anti Slip Decking Oil (430) or Rustins Textured Decking Oil, especially good for decking steps.
To stop decking from becoming slippery again, keep well maintained by regularly sweeping off any leaves or other organic matter, cleaning from time to time with a dedicated decking cleaner and then re-oiling as and when necessary.
Part two in our series of three blog posts about garden decking maintenance takes a look at the most common issues faced by DIYers who want to make their decking beautiful, as well as recommending some of the best-performing treatments.