The No. 15 is excellent for washing off pressing scum and oily finger prints. It is meant as a prescrub and needs to be rinsed off, not just vacuum off and your done. I use it for my first step and scrub with a brush prior to drying with a micro towel and inserting it into my KL Audio ultrasonic for final clean/rinse/dry process. I only do the pre scrub for my first cleaning on a new or used record.