Sorry if my information lead you astray. I have the Tamiya X-20A Thinner and is all I have used. Relooking at the Panel Line bottle I was able to read the label, under a very high powered lense, that Tamiya recommends their X-20, no suffix, for any clean up. The X20A Thinner lists N-Propanol and Butyl Alcohol as ingredients. Another Tamiya product to consider, and what I have used in the past, is their X-19 Smoke. They offer a spray can, but I use the small brush paint type bottle. This is somewhat thinner and works well for trim and chrome grills and is less expensive.