CoverGirl Lash Blast Clean Volume Mascara The oil-free formula is particularly gentle on skin and is equally as effective at removing waterproof mascara. Watch out for bacteria. Although most mascaras officially have a longer shelf life, it's safest to throw away a product 3 months after opening. Each time you pull the wand out of the tube and use it, you're introducing germs from your lashes when you put it back in the tube. They can deteriorate the formulation and lead to eye infections, which