Depending on the browser you are using, here's how you can clear its cache:
1. Click the wrench in the upper-right corner of your Google Chrome.
Open Firefox and go to History menu > Clear Recent History. A window with some items will pop out. Mark the checkboxes of the items that you want to clear (e.g. cache, browsing & download history, cookies, etc.), then click on the Clear Now button.
Go to Tools > Internet Options > General. Under Browsing history click Delete. Select the items you want to delete and click the Delete button next to each item.
Go to Safari > Empty Cache. In the window that opens click Empty to clear the cache.
Go to Tools > Delete private data. Select the items you want to delete and click Delete.