Before applying Oxidex, the surface should be damp to ensure the substrate does not absorb it and it only works on the surface. Always test on a small area before going ahead with the full application.
Syntec Oxidex Heavy Duty Mortar Cleaner
Oxidex is a heavy duty acid cleaner and mortar stain remover for extreme use only and used as the last resort. Oxidex will remove the most stubborn of mortar stains and algae contamination from most surfaces. PLEASE USE WITH CAUTION – Please call for details and guidance