When I used coffee grounds to get out smells, I used the fresh grounds. I don't know if used ones would work as well. I do not know if they would work on Kerosene which is a pretty strong odor. I put a dish in an antique cupboard to get out the stale smell. I had to do it several times. I also used them to remove mothball smell from a camper trailer closet. I used dishes of baking soda at the same time.
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