I have an aerosol based 'oven, and chimney cleaning' product. Here are the contents: Aqua Propylene Glycol Butane Ethanolamine Cocamide DEA Propane Sodium Hydroxide Sodium Laureth Sulfate Xanthan Gum Parfum From the list, it appears that the only active ingredient is Sodium Hydroxide. The rest is either foaming agent, propellant, filler, and perfume. From a chemistry perspective... is Sodium Hydroxide the best chemical to dissolve carbon? For myself, I'm interested in cleaning spark plugs, when testing jetting. The idea is that one starts rich, and then go progressively leaner. To clean up the plugs for the next test, the oven cleaner and toothbrush works, but I'm wondering what is the best solution.