My wife just bought a new white 2013 Hyundai Elantra. Before I applied the 1st coat of wax I noticed some grey dots on the doors about the size of a tip of a pen. I am not sure if this is rail dust since they are grey not brown but I tried to remove with my finger nail and also varsol but would not come off. I am thinking it may be under the clearcoat from factory. I am going to try some solvent and a clay bar but wondering if anyone else had seen this and how they removed them. Also I have been using Mother's Canuba wax and cleaner but someone at a detailing shop said I need to use the 3rd step wax sealer. Is this sealer necessary to protect my paint?