Washed done the shower floor with clear and with vinegar. Made sure it was bone dry and applied the little duck! They are cute and fun. We let them set for 24 hours before using the shower. Three days later they have started to loosen. I now have 4 of the none skid stickers unstuck and I'm sure will come loose. They may work well on a porcelain bathtub but not on an acrylic base.