I use the unger pads from Gardners with the adapter for the Gardner wfp poles
It’s hard if there dirty and a real pain even if you use like a vinegar spray using one quite wet and another dry to polish off
Once there clean though there very effective
I have few customers where we can’t use anything but a damp cloth on the interior and no chemicals, we only oblige as there prepared to pay what it takes , problem is it’s a 6 metres high wall of glass and about 35 meters long and that just the living area seems to take forever