Browse Forums Paving & Concreting Re: Cleaning of coloured concrete splatter from weatherboard 2May 14, 2021 5:57 pm You can also try WD-40. Perform a spot test in a non-obtrusive area first before applying it to the walls.. No, I even have sections of narrowness where the tiles won't slide up any further. When I manage some spare time, I might play around with the first DIY part of my… 7 5141 Yep, efflorescence as mentioned above. You could look to clean it with a "acid" based cleaner and then seal with a penetrating sealer. This may not stop it entirely but… 3 6508 |