This product is used by plugging it in and flipping the on switch.
I believe aluminum.
First, let the appliance cool and then use a paper towel that is slightly moistened in water mixed with one tablespoon of white vinegar to clean up the yellow stain on the heating element. The yellow stain should disappear. If it doesn't then repeat this again with another moistened paper towel and it should work the second time.
Yes I add a half of cup of water
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