Probably the most common and irritating organic contaminant, transferred from freshly laid bitumen surface treatments on the very roads we drive on daily. The issue can be increased in the hotter, summer months due to the viscosity of the bitumen being lowered which in turn makes it easier to transfer from the road surface and be deposited on our vehicle. Typically, the lower half of your vehicle will be more at risk from a build-up of tar spots especially the areas within close vicinity to the road wheels as it’s the wheels that transfer the bitumen compound from the road’s surface up to the vehicle.