According to Tide, there isn't anything in the product (Tide to Go Stain Releaser Pen) that would damage jeans. However, a customer review said that it can't be used on white jeans.
Tide to Go Stain Releaser Pen helps remove even tough grease stains while "on the go" with the combination of a powerful cleaning solution that breaks stains down, and a micro-fiber pad that lifts and absorbs them. It is safe on most colorfast, machine washable and dry cleanable fabrics. Some fabrics may be susceptible to color change. Test on a hidden area prior to use.
Tide to Go Stain Releaser Pen remove excess residue from stain.
Here's how to use it:
Press the tip onto the stain several times to release some stain remover solution onto the stain.
Rub tip gently across the stain to remove it. When necessary, add more liquid and continue rubbing gently.
Important: If treated area will be exposed to direct sunlight, wipe with a damp cloth or napkin to remove excess solution left on fabric.
Discover 7 Secrets to Denim Care So Your Jeans Last Longer, shared by Bustle.