I always mix oils with oils and I simply don't say anything to the recycler. I know AZ used to complain if PS Mineral oil was put in with motor oil, but the way I see it, it's an oil, they're gonna filter & separate it all out anyway.
I don't put carb or brake sprays in, that I let evaporate.
I once brought 10quarts of old gear lube (80w90) and of course it smells that gear lube smell.
they refused to take it. I had to make them call their district manager and he told them it was acceptable. they took it, but weren't happy with me.