For most applications, use at least 8-10oz. per gallon of hot water. Increase as needed depending on soil level. For most grungy tile and grout, expect to use more. Hot water and adequate dwell time is absolutely the key to its efficacy, along with proper agitation and prep before rinsing. For added neutralization and cleaning efficiency, run diluted DSC's Nutra Hero through your machine, and rinse out of your machine afterward before fabric cleaning.