Rejuvenate White Grout Marker Pens instantly color and cover stained, dirty, or old grout, restoring it to its original appearance. These pens make your bathroom and kitchen surfaces look new again, giving your home a fresh, clean look. They cover approximately 320 lineal feet, enough to redo a shower or kitchen. The pens also seal and protect the grout, attacking mold and mildew while whitening and brightening it. They remove stains, making your surfaces look even better.