Hi All
So yesterday I cleaned a sandstone patio that was pretty covered in black lichen spots
First thing I did was to power wash with turbo nozzle to get the worst of it off which came up okay
Then i applied a 15% hypo mix at 4% with surfactant to the wet surface and scrubbed it around and left for about an hour before rinsein off!
When it dried abit it was still pretty much still there which made me think I should I used a stronger mix!
So i made up a small amount of 8% mix to try on a few slabs scrubbed again left for an hour then rinsed off.
Still wouldn’t shift it all so not happy with the end result and the customer too!
Is there anything else I can do or should I have done it a different way?
Any help on this would be much appreciated thanks.
Daz
So yesterday I cleaned a sandstone patio that was pretty covered in black lichen spots
First thing I did was to power wash with turbo nozzle to get the worst of it off which came up okay
Then i applied a 15% hypo mix at 4% with surfactant to the wet surface and scrubbed it around and left for about an hour before rinsein off!
When it dried abit it was still pretty much still there which made me think I should I used a stronger mix!
So i made up a small amount of 8% mix to try on a few slabs scrubbed again left for an hour then rinsed off.
Still wouldn’t shift it all so not happy with the end result and the customer too!
Is there anything else I can do or should I have done it a different way?
Any help on this would be much appreciated thanks.
Daz