Is password input sanitization required?

I’m trying to sanitize any data that’s inputted by making sure the data is valid for a particular field (e.g. a name can’t contain special characters/numbers etc..) However, I’m not sure what to do when it comes to a password field. Would I even need to bother with any sanitization as the password is simply hashed? If the user was to inject anything malicious via the password textbox, should I bother checking for anything suspicious? AFAIK, some users may (should!) have special characters such as ‘< >’, which would normally trigger a potential attack alert. Should I just leave the password field unsanitized? Limiting input for passwords is a last resort for me, as I feel users should use all sorts of characters in their passwords.