Why Coffee Spills Are So Bad for Your Interior Lattes, Americanos, and macchiatos all contain: Milk proteins (which sour and smell) Sugars (which attract bacteria and ants) Acids (which discolor upholstery) Heat (which bakes the spill in) This is the same reason people also search for how to clean protein shake from my car, how to detail a soda pop spill, and remove smell from car seats fast. Immediate Steps You Can Take When a latte spills in your car, quick action is cr