Fix A Stuck Zipper
A buildup of gunk can prevent a zipper from going up or down. Spray some hydrogen peroxide over the area and let it sit for a couple of minutes. That should help loosen the gunk and make it easier to unzip or zip up your outfit/bag again.
You can also go over the zipper’s teeth with a sponge dipped in hydrogen peroxide to clear any other gunk that might be stuck inside the grooves. Make sure to always wipe down the area you’ve applied hydrogen peroxide with water, or launder your outfit or bag after the process.