Got a blender?
Dump two cans of Seafoam and a pound of oak saw dust into it and make sure you mix it up real good. Pour into a casserole dish and drop in the dirty injectors. Stir for about five minutes and then throw in the oven for an hour.
"And I heard a voice in the midst of the four beasts and I looked and behold a pale horse, and his name that said on him was Death... and hell followed with him."