I am still working on the annual for the Cessna. It is being rather slow because the radios are out for repair and I just do a little bit every day. It is now essentially finished. Today I replaced the carburetor air filter which is pretty easy except for one thing. It is soaked in a very high viscostiy oil which gets all over my hands and tools. It is hard to clean up. I use carburetor cleaner as a solvent which seems to work well enough.