The easiest , safest way too get nicotine residue, dirt, oil, or even years of someone's food covered hands touching the face plate is soaking all desired pieces that want to be cleaned an shiny like fresh off the showroom floor is to take a tub fill it with dish soap w/ degreaser oxy power is just the brand I happen to use. Put soap in first then the parts an fill with hot water, let it soak over night. After that empty it , grab a wash clothe, an old toothbrush, qtips an toothpicks for those hard to reach areas an get to wiping! It literally wipes right off. Here's a before and after pic of sx 434 I just did last week.