I have only used TFR and always had great results, just got to make sure you dilute properly! no stronger than 4%.
Thats probably where above post got 'streaks' on pvc from, too strong mix and allowing liquid to dry, BIG NO NO!
Wash off within 2-4 mins, never allow to dry. Always read the label, as they say.
Having read loads of previous posts I think most guys now use Virosol.
Also I have to agree with some other posts from previous lists, that TFR does sometimes leave the UPVC a little 'dull'
whereas a lot of guys on here claim Virosol always leaves It shiny 'like-new' every time, so I am going to order some next time out of interest to try.
Having said that, I tend to think that the 'dullness' of TFR is down to the age and condition of the UPVC in the first place, mainly its age, dullness comes on with years of fading anyway from the suns ultra violet rays.
Anyway heres a video I made from a job using TFR and you can clearly see there is NO dulness whatsoever!
Hope my experiences help you, mostly all was learned from this forum in the first place, so I enjoy passing on any info and tips.
Good luck
Goochie.
http://www.youtube.com/watch?v=kTjl3nMe2UA