M.P.
Try sprinkling baking/wash soda on it. Leave it on with the hatch open for several hours. If possible park so the sun shines on it. Then vacuum. Repeat if the odor has lessened.
I would not put water on it because of the chemical properties of water and gas. Can't explain them. This is just a sense I have from chemistry. Ask the high school chemistry teacher for ideas.
Dawn removes oil. It might work for gas. Both are a petroleum product.