I no what you mean tic tac
When I had the Accord and was on the forums a few members sprayed the chrome bits and look very good.
I would say you would have to rub down prime and top coat
Just found a video
If the marks are water marks, then I would try something like viakal/limelite.
Spray it onto a cloth and rub the mark and see what happens. If you notice it is working, then put the product onto the stain and give it time to work (a minute or so). I wouldn't leave it on paintwork though.
If this doesn't work, then I doubt its a watermark. More like oxidizing or acid rain.
The roof rails are not polished chrome, more of a brushed finish and seem to show every drop of of water that lands on them. Perhaps I could find a way of cleaning them then sealing them it might help.