We understand that you want your PlanetBox to look spot free so we’d like to explain where spots can come from, why they are harmless and how you can remove them. If you have staining on the lunchbox lid in the areas where the magnets are placed, it is because the magnetic material from the back side of the magnets is rubbing off onto the box.   This happens if your box or magnets are not completely dry when you place the magnets on the lunchbox. The discoloration is only cosmetic damage.  The blemishes do not affect the functioning of your PlanetBox and the marks can be cleaned off.  What can be done to fix this is cleaning off the rust, switching to a new set of magnets and always making sure both the magnets and lunchbox are totally dry before putting the magnets on the box lid each time you use it.The marks can be removed by doing any of the following:1)  Gently scrubbing with a fine steel woolor2)  Making a thick paste of water and baking soda, leaving it on the marks for at least an hour and then scrubbing it off and rinsing.or3) Cover the rusted areas with salt and then squeeze fresh lemon juice (stay away from bottled lemon juice, you want juice from a real lemon) over the layer of salt. Don’t discard the used lemon. Let the salt and lemon mixture sit for about two hours. Use the lemon rind as a scrubber to remove the rust. If there are particularly stubborn rust stains, break out the steel wool, a scouring pad or a wire brush. When done rinse off the lemon juice, salt and rust residue and then dry the metal thoroughly.These methods may scratch the metal but any scratches are purely cosmetic and harmless.  There are no coatings on our stainless steel.