Surfaces should be pre-tested prior to use. SAFEGRADE-320 can be used full strength or diluted with water prior to use. The dilution will depend upon the type and amount of soil. Pre-test small areas to determine best dilution rate for each job. Less product is needed if factors such as temperature, dwell time, and/or scrubbing/agitation are increased. Apply by: hand/pump sprayer, or in pressure washer system (low volume mode) on surface to be cleaned. Let stand for a short period of time. Longer times may be required for heavier soils. Rinse with hose, power washer or steam cleaner. Repeat process as necessary.