Chemspec Formula 90 with Biosolv A Specially Formulated Pre-Spray Concentrate For Hard To Clean Carpet Areas. Still the Best .... Even After 20 Years! Over the years, no single product has consistently performed better than our Original Traffic Lane Cleaner. As new technology is developed, we have continued to refine our original formulation to bring you the best heavy soil-loosening and labor-saving pre-spray available. Dilution for a portable extraction machine: