Where does “очистной” come from?
очистной (Russian) comes from Russian очистка, from Russian очи́стить, from Russian чи́стить, from Proto-Slavic čistiti, from Proto-Slavic čistъ, from Proto-Balto-Slavic skīstas, from Proto-Indo-European skidtos, from Proto-Indo-European (s)keyd-.
очистной (Russian): cleaning, treatment
Ancestry of “очистной”, step by step