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Bathroom cleaner cif is the one to use check it is non scratch as some of the supermarket own brands could cause scratches.If the pvc is heavy soiled try loosening it with a soft brush and then soak with warm water and squirt some cif onto a brush/cloth and work it in,leave for about 10-15 minutes (continue doing other windows) and go back and scrub and rinse. comes up a treat. non scratch scourer can help speed things up.
I think you've missed the point in the question ref conservatory cleaning. We don't want to sub-contract or get someone else to do job for us. We want suggestions as to what is the best way for us to do the job.