Go for the non-caustic TFR.
Spray on with a hand sprayer leave for 5-10 mins
then rinse off.
If you leave it on any longer I have found it starts to leave
streak marks.
Russ
Yep, definately the non caustic. Dont buy anything else.
The only diferent thing I do is rather than rinse it off I use an old wfp brush, connect it to the customers tap and scrub the roof and finials, capping etc.
I always go straight to the roof as soon as I get to the house and spray the roof the go off and clean the windows on the house to give the TFR a chance to work but dont bother cleaning the windows above the conservatory until after the con roof is finished.
Gotta go as my sugarpuffs are geting soggy..........