look on instructables i know for fact there is an ible that is about caulking a bath tub
Caulk, here we call it silicone. Anyway, removing it is pretty easy, a normal kitchen knife should do the trick. A damp cloth to clean-up and you're set to re-caulk. Grab a tube and a gun at your local hardware store go for it. I'm not sure what you guys get but the floor assistant should be able to help with the right one. Best of luck!