Cleaning conservatory plastic sheet roof

[RrogerD]

The roof of our conservatory has gotten pretty bad this year. It seems worse this year more than others and, more so on the south (sun-facing) side. In the past and also this time, I have cleaned it with a soft broom and bleachy water but this time it doesn't seem to have touched it. I have a feeling it may be 'mould' growing down inside the actual sheets. They seem to be made of a double-thickness, I assume for insulation.
Any recommendations, apart from removing it all and replacing?
Thanks

 

[Wayners]

Traffic film remover is said to be good.
Machine mart sold it.

They use on caravans and all sorts. Just takes the grime off

 

[crank39]

Be careful what you put on polycarbonate, TFR might be ok when watered down but I once spilt some upvc frame cleaner on polycarbonate and whilst it didn't melt it it left a mark like it started to

If you mean the yellowing then I don't think anything will clean it as it UV bleaching, south facing elevations always suffer, your windows too

 

[accelerator]

I don't think it's mould because it's the wrong colour for that.

It would be worth working out whether the discolouration is on the surface or within the panels. If it's within, I'm thinking it could be something like panel glue that is getting heat damaged by the sun.