How to reset cache in IE?

Question

HTML

Good afternoon. Faced with incomprehensible situations. In IE 9th version (not sure if this matters). Periodically, the old cache of js scripts "returns". I don't know how this can be. The client complains that the fancybox call with some content does not work for him. The call hangs on the menu item by ID.
I go through TeamViewer, update the scripts for the client, clear the cache, everything works out, everything is fine. On the trail. day the client writes that he again does not work. I go, I check it does not work. I update, reset - it works. A day later again.
?v=<some code> is added to the css and js paths. This code itself depends on the file size, i.e. when the file is changed, the path to the file also changes, i.e. everything should be updated.
All in all, I'm a little confused. Tell me, what could it be?

Answer 1

Most likely, the problem is not in the browser cache, but in the caching proxy (some Squid, for example). They just had problems with versioning through the get-parameter - they just ignore it. This behavior is very similar to your problem.
I recommend switching to view versioning styles.bada55c0ffee.css, it fixes this problem. Yes, it is a little more difficult to implement, but not much and these efforts will pay off.