While testing my REST APIs, the previously posted request details are cached. how to clear cache ?

I am applying OAuth2.0 while accessing REST API, but in SOAPUI Browser, once I enter the credentials of User they are cached somewhere, and next time onwards it directly generates the token without prompting for credentials.

The problem is I want to test OAuth with multiple users, so is there any way to clear cache.

Plz help.

Thanks in advance.