Hi tadgh
Feedback for the waffle cloths - both are great at cleaning and last longer than standard microfibres ( this is for internal window work ) we found the heavier grade had less static so picked up/left less particles on the glass but required an extra couple of wipes to get into the dirt.
The green lighter weight cloth shifted the dirt quicker and easier, but did have more static and failed to pick up tiny particles.
Both used on a school clean on the same size glass in the same room - will be setting up some ultra tests this week and get back to you on how that works
Darran