Be careful as bmws factory paint is not very thick, using the right tool for too long and you will go through the paint.
As for the scratches, you will probably not be able to get rid of them completely, a good indication is what the area looks like when wet, that is usually the best you can get it with a proper polish.
The bubbleing usually indicates rust, I would have had that repaired professionally, might get that on the factory warranty actually, dont they have a 5 year rust warranty?
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