Firstly Thanks to Sandy for coming up with a good topic. Appreciate it.
These light scratches often occur with human nails, finger rings, key chain apart from dust and tree saps.
What I have been doing may sound funny but I use mustard oil and even break oil to clear those scratches which don't loose paint. The best solution according to me is also the Waxpol Rubbing compound.
By using the brake oil the scratches become apparently light and the car appears to be clean from them.