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Yes, limestone often turns yellow over time when improperly cared for. The stone contains natural iron deposits, which can oxidize when exposed to water, acids, or harsh chemicals, such as bleach. Without exposure to water or chemicals, limestone should not turn yellow. Always seal limestone countertops to protect them from moisture, and only use gentle cleansers designed for stone.

The frequency for sealing granite countertops depends on several factors, including the type of sealant used, the color of the granite, and how heavily the countertops are used. As a general guideline, resealing is often recommended every 12 to 18 months, but some sources suggest it could be as often as every few months or at least once a year.

The type of sealant is a major factor: water-based sealants may need reapplication every six months to a year, while more durable solvent-based sealants can last for five to 10 years. Additionally, factors like heavy kitchen traffic, frequent use of acidic cleaners, and lighter granite colors may require more frequent sealing to prevent staining.

To determine if your countertops need resealing, you can perform a simple water test. Place a few drops of water or a wet paper towel on an inconspicuous area of the granite. After 10 to 15 minutes, check the spot. If the water has beaded up, the seal is still intact. If the water has been absorbed and darkened the stone, it's time to apply a new coat of sealant. You can choose to seal the granite yourself or hire a professional to ensure it's done correctly.

If you would rather use vinegar to clean the stone fireplace instead of dish soap, this mixture should work fine. Vinegar is slightly acidic, however, so it may etch some kinds of stone without quite a bit of diluting. For a stone fireplace, dilute it to about one cup of vinegar for every gallon of hot water. It’s a smart idea to test the diluted mixture in an inconspicuous area of the fireplace and watch for etching. You can use vinegar to clean quite a few different items around your home, and it’s especially good at removing stains.

The best cleaning method to use for your project will depend on the specifics of that project. However, sandblasting does come with the risk of damaging the surface you’re trying to clean. One safer alternative to sandblasting is laser cleaning, which can remove many of the same contaminants with a lower risk of damage and a lower overall cost.