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You can whiten concrete for unsealed and unfinished concrete with a solution or either muriatic acid or bleach and water—but never both. However, if your concrete does have a stain, finish, or polish, keep in mind that these hard chemicals could damage the topcoat. Your best bet otherwise is to power wash outdoor concrete slabs or clean indoor ones with a gentle cleaner such as laundry or dish detergent.

Yes, you can seal old or existing concrete, but proper preparation is crucial. The concrete surface must be clean, dry, and free of any incompatible old sealant. To check if an old sealer is present, drip a few drops of water onto the surface; if the water is absorbed in under five minutes, it's ready to be resealed. If you plan to use the same type of sealer that was previously applied, you may not need to remove the old layer. However, if you are using a different type of sealer, the old one must be completely removed. Before applying the new sealer, thoroughly clean the concrete and repair or fill any cracks to ensure a smooth, well-prepared surface.

A concrete seal can protect your garage floor from water and stains as can an epoxy coating. The main difference is that epoxy is much more durable and better for heavy-duty wear and tear—it’s used in more industrial and commercial settings. If you’re just using the garage as storage for tools and your car, concrete sealer will do just fine. But if your garage doubles as a workshop for side projects and auto repair, epoxy will hold up better.

Concrete floors are durable, low-maintenance, and customizable with various finishes and colors.