I used a flexible cloth filter from filtrete. It's used to attach to those stupid screen filters in air conditioners (wall units.) It came folded in a box, so instead of bumping back the center console to take everything out, I just took to glove box off, some of the screws and plastic pins then "encouraged" it out far enough to pull out the filter cage, then shove the filter in there until it was deep to every corner. 4 weeks now and no dash dust!
I think it was 11.00.