didn't it do anything like everyone who uses it claims? More glide? More shine? Agreed, I can't see it making anyone 30% faster , but even Dazmond hasn't changed his mind yet!
Maybe if I had been using a heavy brush then there might have been more glide but you wont notice any difference with an
Xtreme, but then do you really want the brush to be gliding over the glass and not gripping the dirt.
I didn't even see the placebo effect that would have at least explained why some might buy it, but then my upvc
window frames are over 20 years old so it would take a miracle to put a shine back on them.