I hate spots AND I'm very sensitive to odors. Petrochemicals, tobacco smoke, mildew, fragrance---ecch. I get almost everything out with ammonia. I know, I know. It's harsh. But----so what? If the stain doesn't come out, it's a loss anyway.

I revamp a LOT of used clothing thrown out by a previous owner because they didn't know how to get that stain out. I soak the item in warm water and 1/4 cup ammonia to start, then rinse. Repeat this several times until odor has faded.

For a specific spot, I rub in a little unscented dish detergent directly on the spot, then pour on a dab of ammonia also directly on the spot. Put in the washer, delicate cycle, circulate a few minutes, then turn the washer off and let it soak several hours. Complete cycle and rinse. This can work for even the most delicate item, if placed in a net bag--I have a front-loader without an agitator, so it's extra-gentle. If some of the spot remains, just repeat until gone.