I had cleaned out my stove in the spring and put an open container of baking soda inside the ashpan to absorb moisture in case a little got in the stove. I just opened my stove for the first time since and there is surface rust starting all over on the inside of the stove. I do have the exhaust & intake a closed off outside with a plastic bag and duct tape but the stove is in my basement. Can anyone give me any insight on this? How do you or what can you do to prevent it? Is this common or do I have a problem? - Thanks