Wiper Bead. Water Repellant Washer GLÀZ® Wiper Bead™ is a windshield washer specially formulated to remove bugs, grime, tree sap and other hard to remove substances. It improves beading properties and protects glass from stain making it streak-free with brilliant shine. Wiper Bead™ should be your choice of wiper washer if your windshield has glass treatment or coating. Crystal clear vision. Improves water beading. Repels water and dirt.