I've noticed that Sunlu's PLA 2.0 is a game changer. My best results with sanding was something I got from a 3D printing cosplayer that she uses an electric footsander. You can control the speed and direction of the wheel turning. It's not too harsh, so you won't take off too much material at once, and you do only a little at a time. The tool is small, so it's not that hard to get into some of the smaller areas. Just wear eye and mask protection from not getting the particles in your lungs. Nasty business from what I'm told.

Overall it looks very clean. I have printed my last 2 in .16 layer height, it adds like 2-3 hours but you see less of the lines when you take off the supports.

Few more pics of this lower. Overall I’m very impressed with how it came out for my first 2A print, even with the roughness on where the supports were.

I started working on them this evening a little by sanding with some mini files lightly. I think going slow and easy with the files and then some light finish sanding with sandpaper will clean them up pretty well.

That looks pretty good!

If you decide to sand it, don’t do it too much and wear a mask. The particles that result from that sanding aren’t great.

There are some acetone based approaches too.

Personally I just don’t try to clean it up more than that, and if you really need the part to be pristinely clean, I prototype myself and then buy a final print from a professional 3D printing company.

There are prints you can use to calibrate the support interface distance and it's specific to your layer height. They are available in bambu software but I imagine you can use them in orca slicer for your specific printer. You can select each tower with a different distance. It's not a long print.

I've had good luck with an orbital sander, but it's going to be a bitch what ever post processing your going to do