[C-Thru.]

Hi Guy, I've been asked to clean these Gazebos at a local school, as you can see from the photos they re very ingrained with algae. The materaial is the standard 'canvas' type.
I've tried a quick test clean with a strong Virosol solution, while it took off a lot of the dirt it didn't really bother heavy Algae.
I need your advice guys on the best way to get these clean, what is best product and method to use in your experience?
Many thanks in advance...
Goochie.

[Dry Clean]

Don't know much about this as I always avoid but have a mate who runs a vehicle valeting business who told me ingrained mould is impossible to remove from fabric, from the picture there looks to be mould on that canvass.
Leave well alone.

[Tosh]

Hypo, neat. It’ll come up blinding!

[dave f]

leave well alone  I suspect some parts may have already started to rot