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You can occasionally use hydrogen peroxide to remove stains on concrete and granite countertops. Hydrogen peroxide is an oxidizing agent that cleans without bleaching surfaces, which is why it’s so popular as a budget-friendly cleaner. However, it’s still somewhat acidic, so you should use it sparingly on certain countertops.

Yes, Corian® and other solid surface countertops can be cut with standard woodworking tools like a circular saw or a jigsaw, but using the correct blade is crucial for the best results.

The recommended blade is a tungsten carbide-tipped blade, often called a solid-surface planer or triple chip grind blade. This type of blade is hard enough to cut through the material effectively. For a jigsaw, a fine-tooth down-cutting blade should be used.

It is important to note that a diamond blade is not necessary. Diamond blades are designed for harder materials like natural stone, concrete, or brick, and Corian is not a natural stone.

Using blades designed for wood is not recommended as they can cause microfractures that weaken the countertop's edges. While a tungsten carbide blade provides a much cleaner cut, the resulting edge will still be rough and must be sanded and smoothed to prevent microfractures from developing over time.

Concrete countertops are made food-grade through their sealant and the continued use of a food-grade cleaner. For that reason, it is important not to use acidic cleaners or bleach. Read the ingredients on any cleaner and avoid products with vinegar, acid, or anything else that could eat away at the concrete's sealant. 

With proper maintenance, concrete countertops can last for decades, with a life expectancy of 50 years or more. At a minimum, they should last 20 years before major issues arise. Their longevity depends on the quality of materials, proper installation, and consistent care. Because concrete is porous, it is prone to cracking and staining. Regular maintenance, including resealing, waxing, and repairing any chips or cracks, is essential to preserve its lifespan.