bottle sterilizer

Starr • Baby #3 Coming Soon! Selenya Avery born July 2016! 🎀 Angel Baby Lily🌸👼🏼 Secilia Elizabeth born October 2021 🌈💖 Maverick due May 2025 💙
Is it necessary? I have a bottle that has mold in it is there a way to go about sterilizing it without needing to buy a cleaner? Don't have much money these days