I agree. For example, in this video they say "1% peroxide" to clean the circular ¿mould? marks. I don't remember any specific detail like that in the videos by

I agree. For example, in this video they say "1% peroxide" to clean the circular ¿mould? marks. I don't remember any specific detail like that in the videos by Baumgartner, just "a mix of solvents", "some cleaners", ...