Stuart, this is how we used to clean with tfr.
1, apply the tfr through a spray pump to top finial first and get that sorted.
2, then apply to 3 or 4 panels at a time.
3, with an old brush just go over what you,ve just done.
4, attatch hose to your pole and wash over and rinse then move on to the next panels.
Be carefull about getting to far infront of yourself as if its a hot day tfr will dry very quickly and leave you with more scrubbing.
Hope this helps you a bit.
Ron.