"If window cleaner works why not put some armorall on after that ;). That should make your records shine real good."
It's what I use. The music emerges from a blacker background.
A good comment and a great answer :-)
Yeah, that is High End. You will find everything. Some years ago I've been in 2 shops from professional record dealers, serious ones. Both used professional Cleaning Machines (VPI 17F, Keith Monks). I was amazed when I saw that but both told me, there is no way out. They want serious money from their customers - for rare records - and of course they try their best to give them a good-as-possible-product.
There are differences :-)