A concentrated alkaline cleaner primarily used for cleaning floor surfaces, such as ceramic floor tiles, slate, stone, marble and terrazzo prior to the application of floor tile polish. The concentrated nature of the product allows easy dissolving of old layers of polish, wax residues, dirt, oils and grease with the minimum of effort. Old tiled floors are easily renovated and brought back to their natural beauty with the three-step system of removal, impregnating and polishing. For large areas a suitable cleaning machine may be used.