CHICAGO (CBS)– Hand sanitizer is important to keep around, but you might not want to keep it in your car on a hot day.

If left in a hot car, it could burst into flames. That is because most hand sanitizers are alcohol-based,  which makes them flammable.

In a Facebook Post showing a burned-out car door, the Western Lakes Fire District in Wisconsin explained how direct sunlight causes a magnification of light through the bottle, causing it to catch fire.