Hey guys. With help from a few guys on the site I have made my own diy wfp for a plastic conny roof job coming up. But I have also been asked to clean a BIG glass conny roof, now i don't have access to pure water so is it worth me taking the job on and saying it wont be 100% or will the results be so bad its not worth the customers time/money? As always appreciate any info. Paul.