elbee . . . yeah, 3M products are somewhat confusing.
I think what you want is #39003 Finesse-it II machine polish.
I've used it with great success at removing fine scratches with my PC. It's a glaze and not a compound. Compounds are definitely more aggressive and IMO shouldn't be the first thing you grab to remove scratches. Advice here on the forum is to start out with the least aggressive product and move upwards from there.
If using #39003 does the trick then you can go directly to a wax or sealant or to something like Vanilla Moose.In fact,I was out in the garage today removing scratches from my Acura using #39003, then Vanilla Moose, then topping with Carnuba Moose Wax. Very nice combo.
Also, your pad choice will affect how quickly the #39003 will work.
The orange pad works great. Has a little more bite than,for instance,Megs #8006 (yellow).
Hope this helps.