Use the vacuum cleaner with the handheld brush attachment from both sides?

Anti-static mops?

Pipe cleaners or anything else like a toothbrush for kids + vacuum cleaner hose next to that to suck up loose dust.

Unfortunately that doesn't get it out. I did try that! Thanks for the suggestion though.

I don't know what they are but I'll get them! Thanks.

Is that not a thumbscrew on the left for removing the grille? Or yes it is, but the wood frame blocks removal?

If it can't come out, and vacuuming doesn't work, you could blast it with compressed air. It for sure will make a mess, and you'll have to clean your filter after, but it should work.

Unless that is greasy dust that sticks onto the surface then I think you're looking at using a damp cloth (or toothbrush like Mysterious-Ad7019 mentioned) and going 1 by 1 to clean them out.

If you don't know what a toothbrush is we have bigger problems than your A/C vent! ;o)

I would just pull it out and get a new one. Those are light diffusers they sell them at pretty much any hardware store cheap and easy to cut.

Or just pull it out and spray with a hose

Unscrew it and take it to the car wash for a pressure washing.

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They look like 1/2" squares, in which case a .50 caliber cleaning mop would allow you to brush each square individually. Yes, that's tedious, but probably the only option that doesn't involve disassembly.

Too small? Try shotgun mops. This 20/28 gauge may fit.

Hahaha, I mean the pipe cleaner of course silly! :p

Non removable unfortunately :(

It can't be removed unfortunately. The unscrew bit only gives access to the filter, not to be able to remove the grate.

Thank you!

Yeah, I knew what you meant. As you said just being silly. :o)