IOS Clear cached proxy credentials

[ITGURU]

Hi,

I've been testing our ipads through a new proxy and the first time i connected and opened safari I was prompted for proxy credentials, so i logged in with a test user.

Now i want to deploy them, I need to change the user.

Apart from a factory which should not be required, i have tried resetting network settings, and also removed all the proxy details and re-applied.

How do i remove the cached http(s) proxy credentials as the filtering reports still show the original testing users details.

Thanks.