Stuck with a cached version? Simply view the page source, click on the link to your CSS file(s) and hit refresh then refresh your page. By manually refreshing the actually CSS file, it will replace any cache version you have.
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I like to do it like this in PHP where it is using the file time as a variable that changes each time is it modified. Automagically different each time:
But, I have also used Marshall's suggestion. In the end, we want to be sure if a customer visits the site, they are getting the latest changes, so I like the versioning.