Will it buff out??

[Ungarsee]

Rather annoyingly I've managed to scrape most of the way down one side of my car while trying to manouvre in a tight spot. I need to clean it up to see how bad it really is but is there a general rule of thumb on how to know whether a good detailer will be able to 'buff it out' (for want of a better term!)

Also, can anyone recommend anyone operating in or around SE London?

Thanks

[Ungarsee]

Cheers all. Never had the car detailed, just cleaned in the normal way. Is a clay bar the best way of ensuring everything that should come off is off?