Discussions tagged with 'usage-rate' Abdullah SLES upper limit in rinse off and leave on products? Abdullah replied 2 years, 5 months ago 3 Members · 6 Replies Formulating Abdullah Different percentages of salicylic acid recommend from different types of products. Why? Abdullah replied 3 years ago 2 Members · 2 Replies Formulating Viewing 1 - 2 of 2 discussions