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How to Remove Old Caulk in a Bathtub or Shower

Whether you’re eliminating mold and mildew or just looking for better aesthetics, old caulk needs to be removed to make room for new, clean, beautiful caulk. Here’s how to do it correctly.

Mold and mildew on your shower walls are getting you down? Excellent news! Sashco’s MildewFree* helps prevent mold and mildew for a clean, healthy shower. You can count on MildewFree to resist nasty mildew growth, or we will pay a contractor to replace it. Give yourself a break from scrubbing those moldy walls and enjoy a clean, healthy shower with MildewFree—a product you can count on with a guarantee to back it up.

If you’re still reading and have yet to make your way to your local hardware store, here are the five most frequently asked questions about MildewFree.

(Convinced? Buy MildewFree on

1. How long will MildewFree last? Does it come with a warranty?
MildewFree is the only caulk with a 7-year warranty and includes labor should the product need to be reinstalled. This is in addition to Sashco’s standard lifetime warranty that provides product replacement. Refer to warranty details on the packaging, product brochure or tech data sheet.

2. What is MildewFree made of?
MildewFree is a 100% water-based acrylic latex caulk specifically formulated to resist mildew growth.

3. Can I use MildewFree outdoors?
No, MildewFree is not recommended for outdoor use. It is better to use Sashco’s other products specifically designed to withstand the rigors of weathering and movement common to home exteriors.

4. Can I use MildewFree to repair grout? What size?
Yes, it will work well to repair grout. Only use on grout lines less than 1/4″ wide. There are better options if you have textured grout or wider grout joints.

5. Can I scrub MildewFree with ordinary household bathroom cleaners?
Yes. MildewFree can be scrubbed over and over again, even with abrasive cleaners, without getting damaged.

Now that you know how to replace old caulking in a bathtub or shower, you can forever say goodbye to mildew problems!

* cured sealant is mildew resistant