Heres a story for you.
Years ago as a teenager I had a small OS engine (20 or 25 ?) I used in an air driven swamp boat sort of thingy. I never did any sort of after run procedure with it, it sometimes ended up in the salt water too, then it got a good fluushing with castor based fuel and restarted to dry out but thats it. I dont ever recall running the boat in non salty water. One day all my modeling gear got put in a box and stashed away in storage. About 4 years later whilst looking for other items Id stored away I found the modeling gear. Curiousity got to me and I pulled it all out, the engine wouldnt turn over at all. I took out the glo plug, squirted in some 4 yr old fuel and let it sit a while. After I got the engine to turn over, I tested the glow plug and to my surprise found it still worked so I filled the tank, primed the engine, attached the glo driver and gave it 3, yes 3 flicks and it started and ran out the whole tank. Now some 15 years later that same engine is in a small RC aeroplane and still flying (a friend has it) and still has NEVER had after runoil or anything added to it, never had anything relplaced, in fact I think he's using the same prop I had on it. We live in a very humid coastal environment and its still fine.
Now Im back into glo I dont do anything after flying except to drain the tank to prevent possible spillage during transport, even then I forget sometimes. I have one engine in storage, its in a sealed plastic bag, but still as it was after it was last flown.