How to disable storing svn password for all users

vi ~/.subversion/config

[auth]
## Add below lines under this section auth

store-auth-creds = no
store-passwords = no

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have a look if there are some files under this directory
~/.subversion/auth/svn.simple/
if so delete the files , those files called password cached files.

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Try now, it will prompt you to enter password

let me know in case of help required