How can I replace the grout in my shower?
To replace the grout in your shower, you will need to remove the old grout using a grout saw or a rotary tool, clean the area thoroughly, mix new grout according to the manufacturer's instructions, apply the new grout with a grout float, and then wipe off excess grout with a damp sponge. Allow the grout to cure for the recommended time before using the shower.