If I'd have sprayed a conservatory roof today and left it 10 mins it would have been bone dry and stained,.... hot or what 
Googled that product but no answers 
Where do you get it?
Cost per litre?
Dilution rate?
Thanks
thats what i thought when i read this post.
sometimes a consevatory roof can appear worse than it is , i have done some really green ones, where green algae has come of real easy with just pure water,
have done others that don't appear to be to bad , until you get close , these are the worst , i find .
daz