Yesterday I did my mates connie glass roof just for the before and after pics..
Now this thing is about 15 years old. Its is covered in green algae. I mean covered.. Its was baked on and had all the look of a swamp monster lair.
gave it a good scoot of G101 and a bit of time to soak in .
Gave it large scrubbing action with my Gardiners sill brush,
Result fairly clean but large areas on the roof of what I would call heavy ghosting. Looking at it its clearly baked on algae…
Im thinking give it a couple of ping wet days to soak. Get into it with strong Mix of G101. shorten the bristles on an old Vikan brush. and scrub like heck..
Any other more constructive ideas?