I have only used Bleach White on resin, however I recently purchased the Por 15 for 1:1 project & may give it try as I have plenty left over. Dawn dishwashing liquid (or the Walmart equivalent) is my go to. The blue stuff. Don't use the the stuff with hand softening conditioners, just pure soap. I wash all opaque & unplated parts before I start any sanding or clean up & then again before I prime.