Many people throw all their towels into one laundry load, believing detergent and hot water will remove everything, but experts say the answer depends on what those towels have been used for.

Kitchen towels and bath towels may look similar, but they collect very different types of bacteria and residue, because kitchen towels often touch food particles, grease, and spills, while bath towels mostly collect moisture, skin cells, and everyday dirt.

If your kitchen towels are only used for drying clean hands or dishes, washing them with bath towels is usually fine when you use enough detergent, a proper wash cycle, and dry everything completely afterward.

The biggest issue is not always the washing machine—it is moisture left behind after washing, because damp towels can develop unpleasant smells and allow bacteria to grow again.

But there is one type of kitchen towel that should never be treated like a normal towel. A simple laundry mistake involving these towels could spread more than just a bad smell throughout your clean laundry.