The best thing to do is wash everything off with cold water (hot water will just cook anything on your skin) - you are already plastered with cold food stuffs so a cooler shower shouldn't be a shock. After that while you are still wet use shaving cream to clean everywhere (it sounds like a double wam session but it really works) rinse and use your favourite shower gel.Make sure you also clean you nostrils!! you might still have some custard lingering there