Q&A for How to Make a Car Air Freshener

Depending on the types of fabric or cardboard you use, about 1-2 weeks, maybe longer.

Try freezing liquid scent in thin layers. Then cut them into pieces and place them between two felt paper sheets. Seal them with a natural gum layer on one side of the sheet. Put the papers in an airtight container for a week or two, then remove them and cut, trim, shape and hang it.

Air fresheners are unlikely to be a danger in your car. Although materials like felt are flammable, they won't get hot enough to catch fire.

One way is to use a photo printer and then glue the photo on top of an air freshener. You could make one out of fabric and cardboard, for instance. There are websites that also sell custom photo air fresheners.