SmartSeal Deck Cleaner - Powerful And Efficient Composite Decking Cleaner & Fence Cleaner- No Pressure Washing - Concentrated Formula Decking Cleaner for Wood - Removes Algae Easily! (2 x 5 Litre)

This stuff is very effective. Rather than replacing my whole deck (I had rotten boards after 20 years), I just replaced some boards and was sceptical that I would get the old boards anywhere near matching the new. I power washed first and this had little impact, but within 10 minutes of using this product the boards were literally matching the new ones. I used it neat, so can't review what it's like diluted, but very fast acting when straight from the container. Before and after shots included.

I’ve used several different brands of deck cleaner over the few years with mixed results and often disappointing, however this deck cleaner is the best one I’ve ever used, I followed the instructions, hosed the decking down so it’s wet before applying the cleaner, mixed it with water in a watering can and applied to the decking, immediately you can see it burning away the grime and any previous decking oil coats, left for an hour and then hosed down and just sweeper it vigorously with a broom and the results are remarkable! Decking looks like new again with minimal work or effort. One word of warning, the cleaner smells a bit of bleach and I accidentally splashed some of it on my leg (was wearing shorts) and I felt it burning. So be very careful. Definitely recommend five stars! Have included a before and after photo.

This is by far the best decking cleaner I have bought over the years. After a disappointing pressure wash this year I bought this with not a lot of hope of our deck coming up any cleaner as we haven’t given it a clean for three years. Wow - as soon as it went on (with a stiff broom) I could see it working. Hosed it off after an hour and it’s like new again, super impressed. Will definitely use again.Decking is 8 years old so wasn’t expecting much….I did use the whole bottle fyi

We bought this product after it being highly rated in a gardening blog. We have a north facing garden so in the winter our decking gets very waterlogged and in turn green. We tried various products last year with no real success and had to pay someone to do it in the end. But this year, wow what a difference! We got the boards wet added the product diluted in some areas, neat in the worse areas left for an hour and jet washed off . Will defo buy again!

Great product really does what it says its does. Delivered quickly - thanks

Gave the very dirty decking a scrub with a wire broom. Put this product all over it (mixing amounts as told with water) gave it a little brush. Left it an hour and washed it off. Decking looks amazing.

The 2 photographs shown are after applying a reputable deck oil and after cleaning. It left our deck very patchy even after following the instructions to the letter. To be honest you might as well use household bleach and a bit of dish soap!

Fantastic removed all dirt from my decking. Like new.