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copied!<p>I know this is an old question, but I have the answer here:</p> <p>It turns out that cookies aren't the only way that UIWebView stores data. There's also this persistent thing called NSURLCredentialStorage and the only way to clear it is thus:</p> <pre><code>NSLog(@"Logging out..."); // Clear credential storage NSURLCredentialStorage *credentialStorage = [NSURLCredentialStorage sharedCredentialStorage]; NSDictionary *credentialProtectionSpaces = [credentialStorage allCredentials]; for (NSURLProtectionSpace *protectionSpace in credentialProtectionSpaces) { NSDictionary *credentials = [credentialStorage credentialsForProtectionSpace:protectionSpace]; for (NSString * username in credentials) { [credentialStorage removeCredential:[credentials objectForKey:username] forProtectionSpace:protectionSpace]; NSLog(@"clearing: %@", username); } } NSLog(@"checking..."); credentialStorage = [NSURLCredentialStorage sharedCredentialStorage]; credentialProtectionSpaces = [credentialStorage allCredentials]; for (NSURLProtectionSpace *protectionSpace in credentialProtectionSpaces) { NSDictionary *credentials = [credentialStorage credentialsForProtectionSpace:protectionSpace]; for (NSString * username in credentials) { [credentialStorage removeCredential:[credentials objectForKey:username] forProtectionSpace:protectionSpace]; NSLog(@"checking: %@", username); } } </code></pre> <p>You''ll find that the usernames show the first time, but don't show when checking the second time through the same loop. They've been deleted from the NSURLProtectionSpaces.</p> <p>-Sean</p>

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