I use petrol, Parrafin, White Spirits, shop bought degreasers and some stuff I get from work which is used in steam cleaners, used neat, it degreases chains fast, diluted, it cleans all grime and oil off with just one wipe.
But from experience, I would not use petrol in your chain cleaner, I did, and after a short while it warped the plastic badly, the cleaning brushes fell out, and in the end it all fell apart. Petrol and certain plastics do not go together. Even the white spirits may have effected it too, but not too sure.
I once had a high viz yellow waistcoat in my car, my petrol can leaked, and one day when I took my waistcoat out of the car, my socket set in a plastic case had welded itself to the jacket and I could only remove it by cutting it free. The petrol had melted the plastic, and then when it dried out, it went solid again but made my jacket a permanent fixture to the socket set.
Petrol though when it dries, leaves a slight oily film, its ideal for cleaning very dirty chains, but then it needs a quick clean with something else to just remove this film, otherwise, you soon get a good build up of dust on your chain
I think you may even find BBQ fluid carcinogenic, virtually everything, made from Benzine, and some forms of naptha, which BBQ fluid (not sure if all are) is made from are carcinogenic