how to clean cookies

in which browser?

details are useful.

In Google Chrome:
1. Click the Chrome menu at top right of the browser toolbar.
2. Select Tools.
3. Select Clear browsing data.
3. In the dialog that appears, select the checkboxes for the types of information that you want to remove.
4. Use the menu at the top to select the amount of data that you want to delete. Select beginning of time to delete everything.
5. Click Clear browsing data.

In Mozilla Firefox:
1. Click on Tools, then Edit | Preferences
2. Select Privacy
3. In the Cookies panel, click on Show Cookies
4. To remove a single cookie click on the entry in the list and click on the Remove Cookie button
5. To remove all cookies click on the Remove All Cookies button

In Opera:
To delete all cookies at the end of every session, select it in the privacy settings under Tools > Preferences.
Click on Manage cookies to delete specific cookies or cookies from specific domains.
To delete all cookies immediately, go to Delete private data on the Tools menu.