Green roof

[Paddyo1966]

Hi, doing a conservatory clean and the roof was very green with algae, have cleaned but still looking a green or yellow. Now not sure if this is in the inside on a plastic roof or sun damage. But have tried a few chemicals but won’t come up clean. Any ideas welcome, last two pics are after clean

 

[Part Timer]

Probably fairly old and the roof has been bleached by the long hot summer last year.

 

[Pjj]

Polycarbonate roofs fade and also grow bacteria in the sandwich part of the panels bit like a double glazed unit there is nothing you can do about that apart from replacing the panels.

 

[Paddyo1966]

Probably fairly old and the roof has been bleached by the long hot summer last year.

That was what I thought

 

[Paddyo1966]

Polycarbonate roofs fade and also grow bacteria in the sandwich part of the panels bit like a double glazed unit there is nothing you can do about that apart from replacing the panels.

Thanks I also told them that, they was happy with the clean but the roof was bugging me lol