Hi cris, if the stripes are for aggregate material, (compounds on the white vitrified), it should be able to be removed with cleaning powder and detergent with a strong but soft cloth, but ooooo. if you scratched the vitrified, it is impossible to remove it, unless you remove the rest, and, if you hide it with something. . ? where you scratched tartar, dirt, various bacteria, and will soon be disgusting. luck