How to Change Moldy Tile Caulk in Shower

Caulk in a shower is usually found along each of the inside corners, where it prevents water from seeping through the joint where the two walls meet. If that caulk has gotten moldy with age, it will look bad and will even warp and erode, allowing moisture it. The old caulk has to be completely removed before you lay in the new caulk. Cleaning the exposed line with bleach will help prevent the mold from returning.

Razor knife
Toothbrush
Bleach
Caulk
Caulk gun
3-inch nail

Instructions

- 1
  Cut away the old caulk using your razor knife, running it along both edges of each caulk line and getting it all out.
- 2
  Wet the toothbrush with bleach and scrub the exposed lines thoroughly, removing any residual material. Rinse well. Let it dry overnight.
- 3
  Load your caulk gun with its caulk tube. Cut off the pointed end of the tube, making a ¼-inch hole there. Push your 3-inch nail into the hold to break the seal inside. Squeeze the trigger until caulk starts coming out the end.
- 4
  Hold the tip of the tube against of the exposed lines, at the end. Squeeze the trigger again and begin moving the gun along the line, laying the caulk line. Keep it as smooth and even as you can. Continue to the end of the line.
- 5
  Release the trigger and raise the gun off the surface.
- 6
  Wet your thumb and run it over the new caulk, pressing it gently into a flat, straight line.
- 7
  Repeat for each of the caulk lines. Let it set for 24 hours before using the shower.

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