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old millitary equipment had a certain smell that I believe was a fungicide. Ill find it in old radios etc. kind of a sticky spray they put in there because they were preparing for humid conditions. old canvas tents can have that smell.
I once picked up these discounted cans of stuff to put on canvas tarps, it smells a bit like that. probably toxic stuff.
Bakelite can give off a smell that is distinctive, smells a bit like formeldehide. maybe there is foam in the seats that is decomposing?
parking it with the windows rolled down just a crack can help.
I tried a kit intended for RV's and things, it came with a plastic container and this white granulated stuff, as it absorbs water it drips into the container. I put it in a humid car and it did attract about a liter of water and the active stuff sort of disappeared.
I think a bag of salt can work, the theory is it wont cause rust since its not in solution and you can dry it , put it in the car and it will absorb water and can be dried in the sun or an oven. I feel safer using a desiccant as I still fear that salt may cause rust.
carpets and everything can go moldy and get weakened if there is too much moisture in there and unused cars that are outside are very susceptible to becoming terrariums. I thik after some of that the carpets and other materials can decompose and not return so that may cause an odor hard to get rid of.
baking soda is cheap and absorbs smells. Id suggest a cardboard box with a couple boxes of it, that you set in the back when not in use , that might help if it bugs you. I like to put some in the bottom of the battery box so any stray battery acid can neutralize upon contact, saves it from rusting out there. i soak a cloth with baking soda and water, let it dry and place under the battery. baking soda and water works well for cleaning battery posts terminals too , I put some in a jar of water , let sit overnight. takes off most of the typical crud that causes problems with continuity, later I wire brush and use electrolytic grease. Its safe to use, even edible.
sometimes I find stinky old books , like old manuals, and put them in a suitcase with a box of baking soda. takes time but seems to help.
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