Cache Problem in Firefox & Chrome

I have a web site which I can't seem to clear from cache because it is not showing recent changes in either Firefox or Chrome on my computer. If I look at it on another laptop in the same house then it displays correctly. I have run CCleaner numerous times and then checked the cache using about:cache which doesn't show the website in cache, however the changes don't show in the browsers.

Does anybody have any idea how to resolve this because it is driving me nuts?!