I've never used oven cleaner and I bet that would be the best and quickest, I'll have to try it next time.
But I have had good luck with a paste made with oxyclean...wet the area the put oxyclean on the wet area, and kinda rub it in with your fingers til it's like a paste, then wet it down some more (I use a spray botte)
I let it sit for about an hour, then use elbow grease. Sometimes I'll work moore oxyclean into it as it foams, and wet it down repeatedly)
Then if there's anything left I find that this works great.
Actually you could skip the ozyclean and use a few of these and elbow grease as well.) But unless you buy them in bulk, it's not economical because they destroy themselves during tough stains.
If there is still anything I find that a fine grit wet/dry sanding sponge (wet of course), going really carefully with it over the post (use and edge of it) will remove the biomatter before it takes off the surface...I use it on my brewpots as well
Also, I use fermcap-s foam control drops in my brewing, both on the stove and in my turkey fryer, you can fill nearly to the brim, get a rolling boil going and (like I often do) go and take a nap between hop additions, without worry about boilovers...