I thought about Gumout. It's pretty volatile stuff, exavporates very quickly and probably leaves little to no trace chemicals. Even if I use that, cleaning again with Spray Nine followed by a long vodka soak, with heavy rinses between each step, should remove anything that might be on the hazordous side of things. A quick dry burn after the whole process is just a little more insurance. Spray Nine is safe to use around foods, but you wouldn't want to drink it, LOL.
Reminds of the dude that fomes to my housexand starts spraying some orange cleaner everywhere then drinks it. He always asks how many are you going to buy. I always respond with. Are you going to finish cleanind or leave it to me. You only cleaned one spot. I had to threaten one dude to leave. He wouldn't take no for an answer.
Last timeI had to powerwash the garage floor. Now to mention it, i love using a power washer.