The Royal Ten (and later standard typewriters in the line) have a mechanism such that when the carriage is advanced it causes the ribbon to advance simultaneously. Sometimes this mechanism can be gummed up with oil causing issues with ribbon advance. Hitting it with lacquer thinner and/or Nu-trol can free this up.

Typewriter Clear Plastic Card Guide Holder Clean Polish White Out Dirt Restore by [[Phoenix Typewriter]]

For cleaning white out off of the clear plastic on card guides try the following: - scrape with fingernail<br /> - Simple Green - Marvel Mystery Oil (from automotive shops) followed by lacquer thinner in miniscule amounts (one drop). The oil helps protect the plastic from melting from the lacquer thinner. Rinse and repeat.

Others have indicated that floor wax stripper will remove white out without damaging the plastic of the card guides.

Fossilized Masking Tape Removed Cleaned from Typewriter Body by [[Phoenix Typewriter]]

The paint on the metal of the SMC 6 series typewriters will generally stand up well to lacquer thinner and along with scratching can be used to remove the old residual masking tape often found on these typewriters.

WD-40, gun bore cleaner, and Simple Green generally don't do much to this sort of tape residue.

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.

Fun tip:

Spraying down a typewriter body and painted portions with oil before treating with lacquer thinner will help to prevent the etching of painted portions which might be splashed during the cleaning process.

It may help to spread the oil out with a cloth or by hand, particularly on the rulers.

Typewriter Platen Cleaning How to Clean Feed and Bail Rollers Rejuvenate Remove Ink by [[Phoenix Typewriter]]

Duane is obviously a fan of lacquer thinner for cleaning platens and feed rollers.