Delete Cache and Cookies - selenium-webdriver

Question

I have different roles of login. Menu will be different for each user login.
I do login for user1 and Logout and then proceeding further user.
On each login, I am using deleteAllCookies() before launching the url. But I am facing that the session is retained and directly logs in the last logged in user.
The following combination I have tried. it did not work for.
public static WebDriver driver;
1. deleteAllCookies()
2. DesiredCapabilities capabilities = DesiredCapabilities.internetExplorer();
capabilities.setCapability(CapabilityType.SUPPORTS_APPLICATION_CACHE, false);
driver = new InternetExplorerDriver(capabilities)
3. DesiredCapabilities capabilities = DesiredCapabilities.internetExplorer();
capabilities.setCapability(CapabilityType.ForSeleniumServer.ENSURING_CLEAN_SESSION, true);
driver = new InternetExplorerDriver(capabilities)
How to avoid this?

Answer 1

I have tried below code and it's working by deleteAllCookies().
WebDriver driver = null;
driver = new FirefoxDriver();
driver.get("http://stackoverflow.com/");
driver.findElement(By.xpath("html/body/div[3]/div/div[3]/div[1]/span/a[2]")).click();
Thread.sleep(1000);
driver.findElement(By.xpath("//*[#id='email']")).sendKeys(<Enter your email>);
driver.findElement(By.xpath("//*[#id='password']")).sendKeys(<Enter your password>);
Thread.sleep(1000);
driver.findElement(By.xpath("//*[#id='submit-button']")).click();
Thread.sleep(1000);
System.out.println("Get");
System.out.println(driver.manage().getCookies());
driver.manage().deleteAllCookies();
System.out.println("Delete");
System.out.println(driver.manage().getCookies());
driver.get("http://stackoverflow.com/");

Answer 2

This works fine for me.
try {
Runtime.getRuntime().exec("RunDll32.exe InetCpl.cpl,ClearMyTracksByProcess 255");
Thread.sleep(3000);
} catch (IOException e) {
e.printStackTrace();
}