The black streaks that appear mainly along the edges of the roof and beneath the windows of your vehicle are known as ‘rain streaks ’. These rain streaks occur because rainwater mixes with dirt from the vehicle and sealant and then runs down the vehicle. This is nothing to worry about and is perfectly normal.
With the right cleaning products, which you can obtain from your Carado dealer, you can remove rain streaks quickly and easily without damaging the protective film. Please speak to your dealer and, when choosing a cleaning product, ensure that it is suitable for your vehicle.