go to Tools, and select Clear Private Data.

Tools > Options Go to Tools and select Options... (on Linux, go to Edit then Preferences).

Privacy > Settings Go to the Privacy tab and click the Settings button.

Clear private data Make sure Cache is checked on the list of options to clear.

Return to the Options menu and click the Clear Now button.

Click the Tools menu, then select Clear Recent History.

Everything Choose the time range of cache you'd like to clear.

Cache Click on Details and make sure Cache is checked.

Select Clear Now.

Select Tools > Safety > Delete browsing history.
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Make sure to uncheck Preserve Favorites website data and check both Temporary Internet Files and Cookies then click Delete. [ Register or Signin to view external links. ]
You will get a confirmation at the bottom of the window once it has successfully cleared your cache and cookies.

Further Troubleshooting

The above procedure for clearing cache and cookies should work for the majority of websites, but certain website and applications such as WiscMail require a more thorough procedure. If you are still having issues, try to steps below.

Close out of Internet Options. Click on Tools and select Developer Tools.

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Click the wrench icon [ Register or Signin to view external links. ] on the browser toolbar.
Select Options
Then select Under the Bonnet
Select Clear browsing data.
In the dialog that appears, select the checkboxes for the types of information that you want to remove.

Choose Preferences from Explorer menu
Select Receiving Files options
Select Cookies
Select the Cookies to be deleted from the list
Press Delete button

Choose Preferences from Edit menu
Select Receiving Files options
Select Cookies
Select the Cookies to be deleted from the list
Press Delete button

Choose Cookie Manager from the Tools menu.
Choose Manage Stored Cookies.
Remove any cookie from the list, or remove all cookies.

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Choose Cookie Manager from the Tools menu.
Choose Manage Stored Cookies.
Remove any cookie from the list, or remove all cookies.

Choose Cookie Manager from the Tools menu.
Choose Manage Stored Cookies.
Remove any cookie from the list, or remove all cookies.

Choose Preferences from Safari menu
Select Security icon
Press Show Cookies button
Select the Cookies to be deleted from the list
Press Delete button

To delete all cookies at the end of every session, select it in the privacy settings under Opera > 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.