EcoProTec Black Spot & Algae Remover 5ltr is a high-performance paving cleaning solution specially formulated to remove black spot, lichen, moss and stains from all types of patio paving including sandstone, limestone, granite, slate, concrete and porcelain paving. This ready-to-use paving cleaner will help keep your patio, garden path and driveway looking its best all year-round.