If what you want is to get them to dry out and you don’t care overly much about the fact that it’ll stink up the car a bit, one option is to get some USB-powered fans and put them in the boots. If you’re feeling fancy you can make a sort of cage/etc around to stop the fan blades from getting stuck on anything.

Or, just stick them with the openings at the floor vents and crank up the fan like John suggests.

Related: years ago, I actually made an enclosed box w/ USB-powered fans to help dry my climbing shoes, which worked pretty well. A second iteration would probably include some sort of odor filter. Such a type of thing would actually also work in a car, as it’s still powered by a USB, which is easy to get car adaptors for.

If what you want is to get them to dry out and you don’t care overly much about the fact that it’ll stink up the car a bit, one option is to get some USB-powered fans and put them in the boots. If you’re feeling fancy you can make a sort of cage/etc around to stop the fan blades from getting stuck on anything.

Or, just stick them with the openings at the floor vents and crank up the fan like Jon suggests.

Related: years ago, I actually made an enclosed box w/ USB-powered fans to help dry my climbing shoes, which worked pretty well. A second iteration would probably include some sort of odor filter. Such a type of thing would actually also work in a car, as it’s still powered by a USB, which is easy to get car adaptors for.