I've had a few more days with it now.
I've been going to a village in my area for some time now and usually dread the winter months coz cleaning the sills is usually a right pita!!! The coal fire brigade are burning in force and leaves awful scummy black residue all over 'em. However, using this Vision stuff, couple of swipes and job done, I was pleasantly surprised. It usually requires some serious elbow grease.
The upvc is cleaning up quickly too.
I'm not particularly the fastest on the glass, like some who can do a 4 bedder in 10mins, but I'm definitely quicker. So maybe, if you're quick on the glass anyway, you might not see much improvement in that regard.