Sticky Rubber Body

Well it seems you're no alone..I saw this on another review site from a user:
"I've owned this camera since October 2013, and I still use it, I love it to death, nearly. It's grips are all worn out, and the one big fault I would say this camera has is the rubberized coating, which degrades over time, my camera got so sticky it picked up lint everywhere and just felt gooey. The mode dial was so gummed up it would get stuck in a spin and the camera was unusable. I used iso-alcohol and a lot of scrubbing and now it works fine, though I may need a toothbrush with some more iso alcohol around that dial again".
This is not uncommon, though usually on cameras much older...I would have tried IsoPropyl Alcohol (available bottled from A mazon) but maybe once rubber has started to perish/soften it'll reoccur, even after you've cleaned the top layer.
Other folk on here may have suggestions - I've not met it myself so never had to try combating it...
"I've owned this camera since October 2013, and I still use it, I love it to death, nearly. It's grips are all worn out, and the one big fault I would say this camera has is the rubberized coating, which degrades over time, my camera got so sticky it picked up lint everywhere and just felt gooey. The mode dial was so gummed up it would get stuck in a spin and the camera was unusable. I used iso-alcohol and a lot of scrubbing and now it works fine, though I may need a toothbrush with some more iso alcohol around that dial again".
This is not uncommon, though usually on cameras much older...I would have tried IsoPropyl Alcohol (available bottled from A mazon) but maybe once rubber has started to perish/soften it'll reoccur, even after you've cleaned the top layer.
Other folk on here may have suggestions - I've not met it myself so never had to try combating it...

I've seen some people use "Sugru" to re-cover the grip (after removing the offending grip)
https://en.wikipedia.org/wiki/Sugru
https://en.wikipedia.org/wiki/Sugru

It is a very common problem; I had to discard a pair of binoculars once with the same issue; I wonder that over time the acid within perspiration reacts with and has a detrimental effect on the rubber; although too late for affected gear it may be advisable to wipe your gear down with a slightly damp cloth carefully to clean off any perspiration.