Where does “oczyszczony” come from?

oczyszczony (Polish) comes from Polish oczyścić, from Polish czyścić, from Proto-Slavic čistiti, from Proto-Slavic čistъ, from Proto-Balto-Slavic skīstas, from Proto-Indo-European skidtos, from Proto-Indo-European (s)keyd-.

Ancestry of “oczyszczony”, step by step

StepLanguageWordMeaning
1Polishoczyścićto cleanse, to purify, to clean
2Polishczyścićto clean
3Proto-Slavicčistitito clean, purify
4Proto-Slavicčistъclean, pure
5Proto-Balto-Slavicskīstas—
6Proto-Indo-Europeanskidtossplit
7Proto-Indo-European(s)keyd-—
Every word from Proto-Indo-European (s)keyd- →Every word from Proto-Indo-European skidtos →Every word from Proto-Balto-Slavic skīstas →