Try a toothbrush with a long, thin handle and a small head.

The brushes sold with many metal and rubber straws or thin bottle brushes are also excellent for reaching into places like this. Sometimes you can find similar thin brushes in the baby bottle section of big box retailers or specialty stores doing baby goods.

Similarly a plastic oiler with mineral spirits in combination with an air compressor/blow gun or canned air is also a solid way to go.

Long handle cotton swabs can also be used if necessary.

reply to u/General-Writing-1764 at https://old.reddit.com/r/typewriters/comments/1l05a17/i_dont_think_that_superficial_dust_should_be_a/

While Zippo lighter fluid (Naphtha) is a bit more expensive per ounce than other solvents (mineral spirits, lacquer thinner, et al), it does usually come packaged in a dispensing container that may make it easier to dispense in a directed method into the internals of typewriters for cleaning them out.

The other benefit is that some may have it on hand for general household use without needing to make a separate trip to the hardware store.

via, but not really directly suggested by https://old.reddit.com/r/typewriters/comments/1g9ntnj/lubricant_reccomendations/

https://www.ebay.com/itm/186572686851<br /> Vintage Remington Touch Oiler Tool 5 1/2" Long Metal Tool

Lube-All Oiler LA124 Triple Pack, 1 oz, 2 oz and 4 oz Bottles with Flexible Spout and In Cap Shut-off Valve<br /> https://crawfordtool.com/products/lube-all-oiler-la124-triple-pack-1-oz-2-oz-and-4-oz-bottles-with-flexible-spout-and-in-cap-shut-off-valve?variant=42824191901937

Bottles that could be useful for dispensing either oil or lacquer thinner/mineral spirits.

Duane of Phoenix Typewriter uses Leak-Proof Lube-all oilers for dispensing lacquer thinner on typewriters.

Lube-All Oiler LA124 Triple Pack, 1 oz, 2 oz and 4 oz Bottles with Flexible Spout and In Cap Shut-off Valve