Doff Super Strength Tarmac & Driveway Cleaner effectively removes green mould and algae within 2-4 days of application and continues to clean exposed surfaces for weeks.
This carefully formulated product can be used on driveways, tarmacs, fencing, decking and most outdoor hard surfaces.
Some surfaces may turn rusty brown; this is a normal reaction and will soon dissipate.
This product is also proven effective in the removal of black mould but residual black mould staining may persist.  
Concentrate makes up to 12L

2.5 Litres