The auxiliary verb for the verb “nettoyer” is “avoir. You have to say “Ma sœur a nettoyé sa chambre.”.
Here is something to start on the study of how to get the basic ending for the past participles of verbs : https://la-conjugaison.nouvelobs.com/regles/conjugaison/participe-passe-1.php.
Then you’ll have to learn the irregular forms and this reference will help you : https://la-conjugaison.nouvelobs.com/fle/les-participes-passes-irreguliers-47.php.
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