So .. nightmare grapes :) U must be wondering what are these white things on grapes?
So first I tried circular polarization filter (cpl). Still I reduced reflection in surfaces facing camera, but sins the camera was going around grapes - the reflection changed its place on surface of grapes in each frame. And that didn't helped with grapes transparency. Next I tried sharper lens and no cpl. All that failed. Then I fought - if I cover grapes with some powder... But the only powder I had at home was flour and coffee :) so thats where these white things come from :)