For non-inflammatory lesions, the mean percent reduction was 25% for clindamycin phosphate gel and 12% for the vehicle gel. The total mean percent reduction in lesion counts at the end of treatment was 38% for clindamycin phosphate gel and 27% for the vehicle gel.or non-inflammatory lesions, the mean percent reduction was 25% for clindamycin phosphate gel and 12% for the vehicle gel. The total mean percent reduction in lesion counts at the end of treatment was 38% for clindamycin phosphate gel and 27% for the vehicle gel.