I don't think I'd bother correcting it again so soon, I'd work on the wash technique so it doesn't get all marred up again right away. No point getting it perfect if that's only gonna last a few weeks. Washing without marring can be very difficult; think about what's involved- how do you move abrasive dirt across the paint to get it off without moving it *under pressure*, which is what causes most wash-induced marring.
There are some simple steps you can take to make things a bit better:
Use a high-lubricity shampoo, preferably one that also features good encapsulation characteristics. I use Griot's Car Wash, but there are other good ones. Cheap shampoos are much harder for me to use without getting marring.
Move the wash media in short, interrupted motions, like "jiggling" a BHB/mitt/etc. across the panels. That way any marring that does happen will be short little scratches instead of long, obvious ones. Preferably, foamgun output would be sprayed at the point where the wash media contact the paint (this can take a good bit of practice as it's sorta a rub-stomach-pat-head kind of thing because you have to move the foamgun differently than your moving the BHB/mitt and you have to move them at the same time).
Keep the wash media clean. As soon as a mitt picks up some dirt it becomes almost like sandpaper, so don't move a dirty mitt across the panels. Rinse it out as often as you have to. Foamguns help with this, but (other than with BHBs, see below) don't eliminate the problem.
Use a free-rinsing wash medium like a BHB and spray foamgun output through the bristles to keep dirt/etc. flushed away. I always do this for the initial passes and the proof of its efficacy is in the rinse buckets- I hardly get *any* dirt in my rinse buckets even when washing a nasty-winter-dirty vehicle; the dirt gets flushed away instead of sticking to the wash media. I do the BHB passes first and then rewash with my mitts.
Don't scrub off tenacious dirt. Wash very gently and remove residual dirt with Sonus green ultra-fine clay. Knead/replace the clay as soon as it picks up dirt, don't move the dirty clay across the paint.
Spray a good QD on the paint before doing the final drying. It can lubricate and even encapsulate residual dirt that somehow got missed during the wash (or that got flushed out from behind trim/etc. during the rinse). Yeah yeah, you shouldn't *have* residual dirt, but it still happens so it pays to be aware of the possibility and have a solution ready at hand.