Never clean a sandwich maker in a dishwasher or with direct soap water. A sandwich maker is an electric device hence the cleaning of this should be done carefully. First of all, unplug the device and remove and separate the cooking plates of the sandwich maker from the device. Dust and remove any crumbs that are present beneath the plates or the gaps under the plates. Prepare a soap solution or vinegar-lemon water. Now neatly scrub and clean the plates. Be careful as not to scrub the plates hard if the plates are made out of brittle or delicate items. Also, make sure that you are drying out the plates completely before inserting them back into the sandwich maker. Alternatively, you can also use tissues or wet wipes to wipe the device clean.