@ chaudhry, you could use swirl X as faizan bhaiyaa mentioned, or what you could do it use a damp mf to give a wipe to the pannel before applying wax, this helps a lot as well. I do the same, water these days is coming alittle hard, it dries to leave behind salt and what not residue, and the marks look horrible, what i do is before applying wax to a pannel i wipe it with a damp mf and then apply wax to that pannel, even after removing the wax give it a light damp mf wipe.
If that does not help the issue, you could either use swirl x or get mothers step 2, sealer and glaze, that is even lesser abrasive than swirl x.
Vinegar is acidic in nature, even though it is a weak acid, it would eventually cause the paint to become yellow with time, im sure no one wants that, it should not even be used on the windscreen INMHO. what say faizan?