When I first started w/c I used to use a carwash pole and brush attached to custy's tap it did a good Job but not one I could say I was 100% proud of, then I changed to wfp and give it a bash with pure water, although I thought it did a better Job, I was still not 100% happy.
I never used TFR or any other detergents, not until I took on a new commercial last year, I was in the office getting payment when I noticed a 5ltr container of ecover truck wash, I asked the custy about it and how much it cost, I was told it was new to them so they couldn't tell me anything about it, asking what I wanted it for (being a w/c) I told them about conservatories and guttering, so the nice people told me to take it on for free and give them some feed back on it
The next day I had a real green conservatory to do, so this was my chance to try it out, mixed it into a 10ltr pressure bottle, applied it to the roof and finials, I gave it 10 minutes to work and then attacked it with wfp, I was gob smacked on how easy the green was washing off every part of the roof.
I phoned the manager up and gave them my feedback as promised, I still don't know the price as I have never paid for the 20ltrs I've had from them so far.
I'm trying to get this company to create a web-site but no joy so far, but if your able to get hold of ecover truck wash I highly recomend it.
I don't even know if they will sell just the odd 5ltrs to the public, but I will make enquiries.
If not you can phone and ask your self.
Ask for Malcom (Sales Manager) or Pauline (Owner) @ K&M Cox Ltd 01963 440430 Just mention my name Jeff the w/c
P.S I make up some in a bucket and dip my gazza swivel brush into it for guttering and finish of with the lance.