CSS not updating in Production Mode

Issue

It doesn’t appear that my merged/minified files are being updated when changed whilst in Production Mode. For example, I made a change to this file:

app/design/frontend/Theme/theme_child/web/css/styles.css

But even after I run the following, the styling isn’t taking effect:

bin/magento setup:di:compile bin/magento setup:static-content:deploy en_GB en_US bin/magento cache:flush 

I even hit the Flush Javascript/CSS Cache button on the backend.

Question

Am I missing a step? Is this a known “gremlin”? Could some of the cached files not be clearing as expected? What folder can I rm -rf to manually purge them so they can be re-deployed?

Notes:

  • The changes do take affect on my Dev Server
  • It’s not my browsers cache
  • I’m not using a CDN