I know it's early, but have a cup of coffee and a fag and chill out eh, Cagey
I was simply trying to be more specific about my ask, because woof woof's original response before he edited it missed the point.
Of course you can't guarantee that dust can't get in between the protective glass and the sensor, hence my original question. I've cleaned sensors on a number of Canon APS-C and FF bodies, so I know how it works and have never had this problem before, and I don't use my GX7 anywhere near as much or in as varied conditions as I used my Canon kit. As said, when trawling a number of other forums the issue has been raised before with some MFT bodies (not all: just because they share a sensor format doesn't mean they are all designed the same way).
@srhmoto: yep, I'd rarely stop down to f/22 to take a picture, even with my 5D3, and I never stop down beyond f/11 with my GX7, so of course the issue disappears at larger apertures. Therefore I'm not overly troubled by at bit of dust, any more than having the same amount in a lens. I was simply interested to see if anyone else had experienced the issue, and whether there was a cost effective way of dealing with it.