first- only a drop of fairy or similar or you'll end up wi loads of suds.
Detailing & clean-up with my said solution is less than when i just used fairy, BUT, although i would never go back to fairy, working with GG3 does have some downsides. the solution is very thin/runny, so sometimes it can run back out of a rubber seal if not detailed or detailed enough (some are worse than others, you get to know which are the bad ones), also, because of this, gorgian windows can be a knightmare as the solution is constantly dripping from every pane so pre-detailing EVERY pane when you've cleaned the one above is sometimes nessesary.
On the whole, with a bit of trial & error + the addition of another product to achieve more slip, IMO it's far better than just using a household detergent on its own.
tony