Pressure Washing Swansea. Swansea Clean & Seal offers Professional Cleaning and Sealing for your Driveways & Patios. Our services include Cleaning and Sealing Block Paving Drives, Imprinted Concrete and recolour, Natural Stone - Sandstone and Tarmac. We also offer Builder Cleans and Softwashing. We offer all these services in Swansea, Cardiff, Bridgend, Neath & Llanelli areas.