Cast Iron Nightmare??

YEP......


Spray it down with a good oven cleaner. Then scrub it with hot soapy water (you want to strip it).

Then place it in a 200*F oven until it is bone dry.

Then coat it with a good oil (canola/olive oil---best is flaxseed oil)
All sides----use your fingers and really rub it in..then wipe it down with a paper towel.

Place it in cold oven upside down and turn the heat up to 500*F (or as high as your oven will go) and let the pan heat up with temperature rise.
When oven reaches temp.....set timer for 1 hour.
Turn off oven...leave door closed and pan inside to cool down for 2 hours.

That's the first seasoning job.......repeat at least four more times to get that smooth dark texture.

We throw it in the fire or into a self cleaning oven, that will burn the oil and probably rancid old seasoning away. Wash it and then re-season it with unsalted lard, then stick it into a oven at 250.

However this is an interesting method to cleanand to season.

Can only suggest. A good cleaning in hit soap and water.
Than re-season it. Just a guess.

get it media blasted and then start seasoning it properly. should be good to go. Either that or throw it in a fire for a few hours first.

You can try the self-cleaning oven method.. I use this to strip before seasoning. I'm sure that this is above WD-40's flash point.