Hiya,
NSI Cleanse removes the residue from cured gel and does a completely different job to scrubfresh.
NSI do a product called Nail Pure Plus and this is more comparable to scrubfresh.
Here is what NSI say about it on their site:
"A natural nail cleanser and dehydrator. New Nail Pure Plus removes dust, oil, moisture and contaminates from the side walls, natural nail plate and under the free edge to reduce possible lifting and promote adhesion. Nail Pure Plus goes beyond the capabilities of a standard nail cleanser, leaving microbial agents behind to aid in the prevention of bacterial infection long after the enhancement service."
HTH