Chrome:
- Press Control-Shift-Delete > Browsing Data > Select Time Range - "All Time" > Click "Cached images and files" and "Browsing History" and "Download History" > Clear data
Firefox:
- Press Control-Shift-Delete > Click "Cache" and "Browsing & Download History" > Clear Now
Internet Explorer:
- Press Control-Shift-Delete > Click Temporary Internet Files and website files > Delete
- Also click Menu > Internet Options > General tab > Browsing History > Settings > "Check for newer versions of stored pages" should be set to "Every visit to the page".