Hiearcool Waterproof Phone Pouch, Universal Case Compatible for iPhone 17 16 15 14 13 Pro Max Plus Up to 8.9", IPX8 Beach Travel Essentials-Black-2 Pack

Yeah submerging your phone or its camera under water will do it eventually. You wouldn't get rid of moisture without taking the phone apart. When you get a new phone, buy a waterproof pouch like this https://www.amazon.com/dp/B082R2TMRV to prevent water damage.