Old school repair guys used a lot of different stuff that's no longer available due to being... Not good. Ha. But naphta was one that's still widely available as white gas aka "coleman/camping fuel" Essentially naphtha with stabilizers to keep it from going bad. Mineral spirits works as well, but naphtha leaves less residue in my experience. Lacquer thinner is good for especially stubborn crap and cleaning slugs, but evaporates really fast and the fumes are no bueno. Alternatively; non toxic degreasing cleaners like simple green are usually my preferred method of cleaning up especially gross machines. Typically very safe on paint finishes and internals, just make sure to keep it off the decals. (It can and WILL erase them if it sits for more than 10 secs) Really though, nothing beats air and a long handled "paint" brush. My air compressor and blow out tube are some of my most cherished tools.

Mineral spirits are still the best for cleaning non-painted metal parts. Magic in a bottle, this is! Be careful to avoid getting it on painted surfaces, rubber, and/or plastic bits.

Sanding and polishing the keys on my Smith-Corona Silent Super. A lesson to all, use foil when using PBlaster to clean, not a rag. It still melts plastic when it soaks through the rag…

delivery-dan 2 points3 points4 points 6 hours ago (1 child)Mineral spirits with just a touch of transmission fluid. Used to own typewriter repair shop large parts washer with mineral spirits with transfluid strip off case and submerged in fluid ti clean then air blower to dry and reassemble. Wd 40 marvel mystery oil will only be temp fit and become worse over time.

Here it’s outside being cleaned with Mineral Spirits, and carb and choke cleaner. I took one trip to the eye doctor when the carb and choke cleaner bounced and sprayed into both my eyes. I was fine, but wear eye protection.