i own a mk5 astra 1.7 cdti '05. I bought this car recently and have noticed that the rear of the car, near the vauxhall badge and the shiny chrome strip with 'Astra' written on it, feels a bit rough. I first noticed this when I took the car for a wash, and when it was finished, small threads of the cloth they used to dry the car was stuck over the surface of the rear. I gave it a feel and Then noticed the rough surface. When I had a closer look, you can see tiny speckled of rust. This is over the paint, the badge and the chrome strip. I have also noticed speckles of something over the rear glass panel, all apart from the area where the wiper wipes.
The weird thing is that giving it a bit of a rub helps to clear this. Does anyone know what this is and how |I can clear this back to a smooth shiny surface?