Tear Stain Remover is an external application that gently removes tear stains and, with regular use, prevents reoccurrence of stains. Easy to apply. Moisten cotton wool with product and gently wipe over eye. Remove excess residue with clean dry cotton wool. Daily use may be needed for heavily stained areas until mark had dissolved. Product contains boric acid, zinc sulfate, propylene glycol, surfactants, preservatives, buffers and water.