For the best results, the ball track should be used on a smooth surface like the fiberglass or acrylic tub surround walls, or the tub sidewalls. If you have a tiled and grouted tub surround, the suction cups may not adhere well. Smooth tiles will work best. Tiles with a textured surface may make it hard for the suction cups to hold because they cannot seal completely to the surface. Tips to increase the hold: Soak in water first or apply a small amount of petroleum jelly to the cup edges to create a seal. Tips to loosen the hold: Apply soap along the cup edges, or carefully slide a butter knife under the cup to release.