Men's gel deodorant, blue color. The gel doesn't stain, really, but the blue colour also kind of helps in place of blueing agent (used to neutralize yellowed textile back to white).

I "stole" my SO's Old Spice Wolfthorn, the scent is subtle enough to not mess with my perfume. I've tried countless brands and types, no ladies' deodorant worked as well for me. Other men's lines might work just as well as the brand mentioned.