Firefox, Internet Explorer, Safari, Opera and Chrome:
Open Firefox and go to Tools > Clear Recent History. Choose the time range and the items you wish to clear and click Clear Now.
Internet Explorer 6:
Open Internet Explorer 6 and go to Tools > Internet Options > General.
Click Delete Files. Check the box next to Delete all offline content In the window that opens and click OK.
Internet Explorer 7 & 8:
Open Internet Explorer 7 and go to Tools > Internet Options > General. Under Browsing history click Delete. Choose which items you wish to delete and click the Delete button next to each item to delete it.
Internet Explorer 9:
In Internet Explorer 9 go to Tools > Safety > Delete browsing history. Then untick the option for Preserve Favorites website data, tick the options for Temporary Internet Files and Cookies and click Delete.
Open Safari and go to Safari > Empty Cache. Click Empty in the window that opens to clear the cache.
Open Opera and go to Tools > Delete Private Data. Choose which items you wish to delete and click Delete.
Click the wrench icon at the top right corner of the screen and go to Tools > Clear Browsing Data. Select the items you want to delete, choose the period for which you want to delete them and click Clear Browsing Data.
Additionally, in order to speed-up the process, you can try clearing your local DNS cache.
If you are having cache problems with your website, ask your host for assistance.