When doing mobile development of plugins, you need to purge the tool_mobile/plugininfo every time you change the CSS.

You can just use Purge all caches, but that is horribly slow.

Of you can go to the cahce admin page, find the right 'Purge' link in the middle of the page (which is slow) but then the actual purging is faster.

It occurred to me that there are probably other cases, when you are tring to fix a specific thing, where you might need to purge the same cache a few times in a row. Therefore, I propose to change the "Successfully purged the requested definition." Notification to instead say something like "Successfully purged the "This stores the list of plugins with mobile addons (tool_mobile/plugininfo) cache. Purge again."