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Replace Mildewed Caulk Around Bathtub

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Dear James: I am a real stickler about keeping my bathroom clean, but the caulk around the bathtub and sink always has black mildew. Is there anything I can do to stop it, and how can I remove the old caulk? — Kathy P.

Dear Kathy: Your second question is your best answer for your first question. For a long-term cure to this problem, at this point, is to remove and replace the old caulk with a high-quality mildew-proof bathtub caulk.

The caulk in bathrooms, particularly around bathtubs, is an ideal location for mildew. Caulk is actually porous and stays damp for a long time after bathing or showering. Soap, shampoo, body oils, etc. are all excellent nourishment for the mildew spores to thrive and reproduce.

Here are a few tips to reduce the growth of dark mildew. When you are done bathing, rinse off the walls and caulk with water to minimize soap and oil residues. Leave the shower doors or curtain open after bathing so that it dries faster. Run the bathroom vent fan for about five minutes, too.

There are new bathtub caulks that are truly mildew-proof with lifetime guarantees against mildew growth. All bathtub caulks, even the cheaper ones, have some mildewcides in them, but the more expensive caulks have much more of these chemicals.

Each time water comes in contact with the caulk, a slight bit of these chemicals leach out to block any mildew growth. Obviously, a caulk with a higher concentration of these chemicals stays mildew free for a longer time. Check the label on the tube of caulk for the word mildew-proof, not just resistant.

The difficulty in removing the old caulk depends much on the type of caulk that was used.

No matter what type of caulk it is (non-acrylic water-based, acrylic water-based or silicone), first scrape out as much of the old caulk as possible. Don't try to remove it all by scraping, or you will surely scratch the surfaces.

Wear heavy work gloves and plan on taking your time for this job. Use a utility knife or a strong scraper. If you try to rush, you will either end up cutting yourself or slipping and scratching the tile, bathtub or plumbing fixtures.

If the old caulk is non-acrylic, laying a wet rag on it for several days will make the material swell and allow you to peel most of it off. If it is acrylic caulk, 90 percent isopropyl alcohol (works better than rubbing alcohol) should make it lift off the tub and tile.

Silicone caulk is the most difficult to remove because it is resistant to most solvents. Some strong alkaline chemicals may weaken the old silicone. Follow the manufacturer's usage and safety instructions carefully. 3M makes a silicone caulk remover that may also help.

Now you are ready to begin to apply the new high-quality caulk. Cut the tip of the tube of caulk at an angle and size the opening to the width of area you want to fill.

If you are using acrylic water-based caulk, you will need a bucket of clean water to clean and smooth the caulk bead. If you are using silicone, you will need lacquer thinner. Lacquer thinner is extremely flammable, so do not smoke, and open a window.

Apply the caulk slowly and only about two feet at a time. Use your finger to smooth the bead. Wipe the excess off of the tile and tub with a wet sponge (water-based caulks) or a rag with lacquer thinner (silicon caulks).

Send your questions to Here's How, 6906 Royalgreen Dr., Cincinnati, OH 45244 or visit www.dulley.com. To find out more about James Dulley and read features by other Creators Syndicate writers and cartoonists, visit the Creators Syndicate website at www.creators.com.

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