How to clean your Patio with Brick and Patio Cleaner by Bostik (Brick Acid)

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Buy the Patio Cleaner here - www.ebay.co.uk...
There are loads of chemicals you can buy on the market that will promise to clean the stubborn stains left behind after your annual patio a pressure wash. However they all seem to do a pretty naff job and in my view there is only really on solution...Brick Acid
Yes Yes I know it has risks and might not be safe for all surfaces but it is purely about getting the dilution of water to acid right.