Forgive me if this sounds a bit bonkers but, when I did a Boatbuilding course a few centuries ago, we were taught how to remove dust specks from the final coat of gloss varnish.
The method is to use the REVERSE side of a piece of sandpaper - grade seems unimportant. Start with light strokes and increase pressure if necessary. Never tried on paint but it certainly works on all types of varnish.
P.S. This is not 1 April!
Not bonkers at all, I remember a painter showing me this about 40 yrs ago, trick of the trade.
