There are many different web hosting companies for Managed WordPress. The top ones include WP Engine, GoDaddy, BlueHost, HostGator and AWS. However, there are also several smaller ones.
The best quality service provider related to these services is WP Engine, and this is NOT a sponsored post, it’s based on years of experience trying a ton of different webhosting platforms.
Clearing your website’s Server Cache is something that your webhost needs to offer, but it’s done in different ways depending on the platform. This video shows how to clear your cache on WP Engine.