I used the brush on a first clean last week, a big school, in fact it took 3 days for the outsides. Great splay, good scrubbing, got into the corners to get rid of the spiders nests, they had not had a clean for around 10 years plus. I am a Vikan fan, but was extremely impressed on how it performed and how light it is compared to my Vikans, so i will be using the SL brush from now on. I also used hot water with it as well, it has not lost its shape one bit either.