This liquid concrete cleaner combines the stain-lifting power of hydrogen peroxide with the degreasing ability of d- Limonene to lift away tough oil and grease stains, even if they have been set-in concrete for years. It is specially formulated with a stable form of hydrogen peroxide at a high pH level, so it remains in an active state for a longer period of time than other “oxygen-based” cleaners. It can also be used to prepare concrete surfaces for etching, sealing and decorative staining by removing the contaminants that inhibit these processes. Restores original color to decorative concrete surfaces.