How to Tell if Moldy Caulk Can Be Cleaned or Needs Replacement

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If the mold on your caulk is just surface-level and the caulk is still flexible and intact, you can often clean it with a bleach solution or a specialized cleaner. However, if the mold has penetrated deep, the caulk is cracking or pulling away from surfaces, or it's been moldy for months, replacement is the only safe option to prevent health risks and moisture damage.