#401B Nu-trol Control Cleaner for Electronics, a specialty cleaner

Nu-trol is a a degreaser/cleaner which also has a bit of oil in it as well for cleaning and oiling the rails, mainspring, and friction points of a typewriter. Follow up with compressed air to knock off the excess.

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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.

Olympia SM Typewriter Wash, Scrub Clean Lid Cover, Restore Paint by [[Phoenix Typewriter]]

Simple Green gets off most dirt and nicotine as well as some White Out. Duane uses Nu-Trol Control Cleaner (for electronics) as a mild specialty cleaner for tougher White Out cleaning.