When Passwords was released in iOS 18, I went to clean old stuff, 3-5 years of sites I don't visit anymore took me about an hour. You can back up your password

When Passwords was released in iOS 18, I went to clean old stuff, 3-5 years of sites I don't visit anymore took me about an hour. You can back up your passwords to a file and erase anything that you don't think is worth keeping, in case something turns out to be actually needed the password is there in the file.