With concrete countertops, it’s important to stay on top of the spills. "Clean spills as soon as possible". The sealer buys you time and provides protection, but doesn’t make the concrete indestructible. Avoid setting hot pans and dishes on counters as they can damage the sealer. Knives can cut through the sealer, creating weak spots. Mild soap and water makes a good cleaner for concrete counters. Use a dishrag or sponge and avoid scouring pads. Cleaners containing abrasives, bleach and ammonia should not be used since they can damage the sealer. A neutral pH cleaner can be found in a tile store.