Do not trust your sense of smell. Food may be unsafe, even if it doesn't small bad. Hard cheese usually keeps well at room temperatures. Other cheeses, such as cream cheese, opened containers of cheese spreads and cottage cheese, spoil quickly. Throw them out when an off-flavor or unusual mold develops.
Milk spoils quickly without refrigeration.
Throw out spoiled milk. Soured milk may be used in baking. Custard, gravies, creamed foods, chopped meats, poultry and seafood sandwich fillings spoil quickly when unrefrigerated. They are ideal growing places for organisms that can make you sick. Dispose of these foods if they have warmed to over 40 degrees or room temperatures.