* Recycled Cotton Lunch Sack: Machine wash cold, line dry * Round Food Containers and Lids - Dishwasher safe, we recommend hand washing the plastic lids. * Napkin - Machine wash, machine dry, light iron or lay flat on top dryer to dry * Food Kozy - Hand wash with warm soapy water * Should you experience the appearance of "rust" on any stainless steel product, it is more than likely a discoloration or harmless residue left behind from the electro-polishing process. Buff it out with an SOS or heavier kitchen scrub brush.