Removing all sanding dust

How can you get all the sanding dust off a project before putting poly on it

Gun stock

Good morning. Re-did my gun stock. Beautiful white-ish blonde color. What do I need to do to seal it. And maintain that beautiful color. Satin finish. Attaching photos. It's not sanded yet. Thanks!

Oil stains on an untreated wood console

Hello brilliant wood workers! I have a lovely console table that I bought on Etsy and didn't realize was completely unfinished/untreated. Unfortunately in the course of normal life, people (my husband) have put things on it that left stains, including a bottle of fish oil that we put on our dog's food. I have tried a few remedies I found on the internet to get the stains out (like Simple Green, dry cleaner solvent, etc) but haven't found a miracle yet. Is there anything that you guys think I could do to get the blemishes off the surface?