I am using colin from a month. Since I have seen many ads about it, I bought this one and now I am totally disappointed. It is not working that much as I expected. It doesn’t clear dust properly and about old dusts, when I applied it there was no difference. About shining ? Forget it ! I think even normal water is better than colin. I tried to clean all my mobile and cover but the edges remain same dusty. When I tried it in my TV and other thing, I noticed that it’s only cleaning the mirror better than water. About shining ? Forget about it ! No better results even rubbing roughly.
So I would recommend not to use Colin and instead of it there a some gel available in market that are useful.