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Best laptop i ever had

Have you tried compressed air? I had a similar problem with an old 12" MacBook with the old super shallow keyboard and compressed air helped me blow crumbs out.

That just worked! Thanks!

If the compressed air suggestion doesn't work, you could also try 90%+ isopropyl alcohol which might work to dissolve any bits and is electronics/keyboard safe. Otherwise, drop a line to Tuxedo support, I've seen XMG/Tuxedo guys be very active on their forums/subreddits, so I think you have a good chance of getting a useful response from them.