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I'd ask this question in the Car Care Products forum. You're going to have to give them more details about the scratch in order for them to properly advise you on the products and techniques needed to remove it.
I've had some luck with wax products designed to hide the blemish (if the scratch isn't too deep) It does require constant application to keep looking good though (like every week) I'm planning on wet sanding this spring ( If I get the nerve up) it's about the only way I know of besides a re-paint.
Im not too familiar with thw swallow scratches, but if you mean shallow scratch, you can machine buff it out with a medium compound then re-wax whole car. There are some petrolium/silicone products that mask the scratches but they are temporary and dont always fully remove it. Just be carefull you dont buff thru the clear its easier to do on an older car. :cheers:
If the scratch is just in the clear coat you can probably remove it using 3M's Finese-it II. You can pickup a bottle at your local automotive paint dealer. This is what the shops use. If your not experienced with a buffer, I'd recommend rubbing it out by hand. Finese-it is basically a 2000 grit liquid sand paper. If your concerned about having it done right and not damaging the finish you might stop by a good paint shop (dealer or 3rd party) and see what they'd charge you to buff it out. Probably won't be much.
Afterwards if your not a Zaino user you can consider using the Z5 with its scratch and swirl mark remover to finish it up. After a few applications most of all those micro fine scratches you can see by tilting your view angle under the lights will be gone. Its not permanent, so as the Z5 wears off repeat applications restores the mirror finish minus the micro scratches.
Go to a automotive paint dealer and get a pint of black single stage paint and a small artist brush apply several coats with the brush wait a week of so and repeat the process till the stratch is higher than the rest of the paint.
After the paint shrinks apply rubbing compound with your finger till it matches and then polish the area.
The trick is to build up the stratch.