I use Mousemilk.
It works.

pull starters on cessna's???? is that like on my lawn mower... and you cessna guys laugh at us Maule drivers!!!!!

Don't forget, B.D.Maule invented and manufactured the electric-less starter.
Though not a pull starter, one wound a handle on the panel which wound up a "rubber band" under the belly.
When released it spun the engine with a centrifugal pawl.
The museum in Macon GA has one displayed with other BD Maule stuff.

We used to run some P-Navajo's ....... Mouse Milk was the only thing I ever found that would keep the wastegates from rusting and freezing constantly. I don't use that much of it, but it works.