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Clorox foaming spray works great. Just spray it on and leave it sit. No need to rinse or scrub. It may take several applications. It is washed off when you use the shower the next time. it will even remove mold behind the caulk after several applications.
The best solution would be to remove the existing shower base and install one that was properly set up to drain. There are different solutions depending on what you have existing there currrently. What kind of material is the shower base?
If you hired a licesned contractor to install the tile, the leaky pan should be under warranty. I recommend tearing out the entire shower. Even if you have to pay for the replacement tile, I would not do a repair because tearing out the pan compromises the waterproofing on the walls. Also, there are many methods of waterproofing the pan area before tile is installed. We always use the hot mop method. I would avoidAvoid vinyl liners or Red Gaurd. These are cheap unreliable options.
Murray Lampert Design, Build, Remodel
You need a licensed plumber to repair/replace the shower liner. a lot of remodeling companies do not use license plumbers because they are not cheap, and it cuts into there profit. I have been in the plumbing industry for 9 years now. give me call to schedule a free estimate for that leak. 832-557-3293
Suggest that you find a reputable and skilled tile company. If it was a vinyl pan, it may be possible (although not ideal) to tear out the floor and lowest 6-12" of wall tile to replace the pan. It's really something that cannot be easily answered without a close professional examination of the particulars of your shower conditions.
BOMB SQUAD ANSWER// HTH or better known as house hold bleach. As an Explosive Ordnance Disposal Operator House hold bleach can be your greatest weapon for biological items such as mold. Add a little dawn soap to stick to the surface. Spray, allow to treat, and then scrub and rinse!
Pres Gavigan Construction http://gaviganhomes.com/about-us/
This is a spot where cracks often develop. After cleaning with a a mildewcide, check carefully for a crack. If the grout is cracked, open the crack up a little wider with a grout saw (inexpensive at a hardware store) or steel blade and fill it with a color matched caulk or sanded sealer from the tile store. If the crack has moisture, let it dry well before caulking.
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