I made it slightly stronger than directed ie. 30 to 1 instead of 40 to 1
Yes we still had to pressure wash off using vario nozzle on quite a wide angle, it all came off without any hassle, although the chimneys were awkward as the telescopic lance was rubbish
I not sure if using the algoclear made it easier to remove or not ( lack of experience ) but the builder specified a fungicidal wash, so that's what he got.
1 hour to apply, and it took 4 hours to wash down
Darran