This is how to clear cache from your browser and why?
Click on Tools (the wrench icon) > Options.
Click on the Under the Hood tab, then the Clear browsing data... button.
Check the following: Empty the cache. Delete cookies and other site data. Select the beginning of time in the drop down box and click on the Clear browsing data button.
Select Tools > Internet Options.
Click on the General tab and then the Delete... button.
Make sure to uncheck Preserve Favourites website data and check both Temporary Internet Files and Cookies then click Delete.