Will try windows.flybobbie said:What happens if you drop windows a few millimetres?
Biggest rattler is the plastic wedge on rear window where it goes into deck.
Try black tape either side of the wedge and stick some felt pads on the horizontal of the T piece. Use some of the furry bits of velcro or those furniture or hifi pads from Wilco stores.
I then use silicon spray around all rubbers once a month, seems to do the trick.