I recently pulled apart my '97KRS, so I can tell you what deteriates most and where:
Salt on roads is the worst killer if you ride when they put it down. The parts most affected are under the transmission around the side and center stand mountings (important for integrity!), the rear of the transmission casing (have you got a rear hugger?), around the ABS and battery casing, the front end and topside area of the swinging arm and its bushes.
If you have the well known timing cover oil leak, you'll do better on the corrosion stakes further up front.
Look carefully at the silver painted parts in the above areas. If you see signs of paint bubbling or white deposits, that's corrosion probably from road salt. Most black painted parts on the bike e.g stand, are pretty thinly painted so rust easily. Unfortunately these are usually parts you don't look at too closely. BMW seem to have used a very hard (silver) acrylic paint laid on very thick. It's virtually impossible to strip and appears to have no conventional primer underneath. Once stone chips/salt/water get through, the ali base casting will corrode fairly quickly.
Since I had all these parts out of the frame and did a certain amount of re-painting, I decided to cover everything in Waxoil before the parts went back. I don't know how long it will stay on. It's sticky stuff and not to pretty, but then it's mostly out of sight. I shall blow over these areas again with Waxoil in a kerosene air spray gun.
I do use a pressure washer carefully and I think frequent hosing during winter will keep the salt away, particularly in those areas I mentioned. I'm careful around the HT coil, plugs and ignition on the left side so hose rearwards from underneath. I'm now going to start taking off the under belly cover more often.
Yours is a newer bike, you may not be seeing any of this yet. My reply is more about what you might get and how you might slow it down.
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