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This can be filled with water or sand

Dry Applications The most effective way to get the smoke smell out of your hair is to wash it , but, that may not be a simple solution if you are dispersed camping without access to lots of running water for taking showers and washing hair

solution or dispersion should be clearly understood as including any aqueous mixture where cellulose acetate is water soluble (a solution), where it is generally or substantially insoluble (a dispersion), and any combination thereof (e.g., for aqueous mixtures containing both water-soluble and water-insoluble cellulose acetate(s))

HR, 1.28

With that in mind

Target problem areas After you allow the freshly cleaned surfaces inside your car to dry, check to see if you can still smell smoke