A lot of ppl swear by virosol....I've been cleaning UPVC and conservatories near on 10 yrs, always used just tap water.
When cleaning frames, doors etc I use a cream cleaner.
For gutters, soffits etc, I hook up to the custies tap with my pole, and clean away. As soon as the green algae gets wet, it comes off, no matter what you use.
Bought 25 ltrs of TFR 7 years ago to try cos everyone was singing its praises, took longer cos had to wash the TFR off. It's still in my garage