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maybe algon or similar might clear it but you will have to wait for it to work and dry not the best time of year to be treating fences. maybe a long handled brass brush might clear it the type you can get for cleaning decking
We have a run of fencing to do, similar to yours. Have cancelled twice due to weather, and have agreed to do it in spring now.
Going to give it a spray over with MMC Pro, then lightly jetwash it and leave to dry. Then repaint.
As Scott says, spray with MMC Pro, I'd then wait a week and see what it looks like. If needed, I'd probably use a broom and water to scrub dirt off if necessary, before applying preservative.
Hi Daniel. I use mossaway from Ashland chemicals and it works well but takes longer in cooler weather than in the summer. I did a test for a customer who was a bit unsure but phoned me to say complete spraying the rest of the panels as all the moss had disappeared within days
Hi Daniel
Our recommendation at Fencign Essentials ( www.fencingessentials.co.uk ) would be to use a still brush to remove as much of the green algae, lychen or moss that has attached itself to the fencing first. Then treat the panels with a proprietry product that will kill off any remaining spores and particles that remain and they will even if they are not visible. This should be left for a period of time in accordance with the manufacturers instructions, and there may be a need for a follow up treatment at this stage, this will depend upon the extent of the problem. As others have said here a longer time needs to be allowed than if completing the process in the summer months. I think that then you may wish to consider a gentle power wash then allow the timber to dry completely. This is easier said than done at this time of the year and we would see this project as a job for the summer. Once the timber is completely dry then the colouring/treatment can be completed.
Hope this helps.
Try Benzalkonium Chloride, fancy name but the active ingredient in lots of patio cleaners, usually comes as a 50% solution whereas patio clear and the like are around 7%. Works out a lot cheaper and at10% dilution shifts algae, moss, liverworts and lichen but not plants with true roots. If there is a lot of residue a quick scrub over with a stiff yard brush will shift it.