In this tutorial, we learn how to grout tile in your custom tiled shower. First, you need to score away anything in between the seams of the tile. Now, grab a bag of sanded grout mixture and grout enhancer. Next, wash the surface of the tile with a damp sponge to take off any impurities. Then, mix half the bag with half the enhancer and stir until combined. Use a tool to rub the mixture onto the walls and leave it on for 15-20 minutes. Now, go over the area with the mixture and go over it with a damp sponge, then wait 15 minutes and repeat the process until you have most the grout off. Use cheese cloth to buff the rest of the grout off, then your shower will be finished.