How do you get rsync to exclude any directory named cache?

I'm new to rsync and have read a bit about excluding files and directories but I don't fully understand and can't seem to get it working.

I'm simply trying to run a backup of all the websites in a server's webroot but don't want any of the CMS's cache files.

Is there away to exclude any directory named cache?

I've tried a lot of things over the weeks (that I don't remember), but more recently I've been trying these sorts of things:

sudo rsync -avzO -e --exclude *cache ssh username@11.22.33.44:/home/ /Users/username/webserver-backups/DEV/home/

and this:

sudo rsync -avzO -e --exclude cache/ ssh username@11.22.33.44:/home/ /Users/username/webserver-backups/DEV/home/

and this:

sudo rsync -avzO -e --exclude */cache/ ssh username@11.22.33.44:/home/ /Users/username/webserver-backups/DEV/home/

and this:

sudo rsync -avzO -e --exclude *cache/ ssh username@11.22.33.44:/home/ /Users/username/webserver-backups/DEV/home/

Sorry if this is easy, I just haven't been able to find info that I understand because they all talk about a path to exclude.

It's just that I don't have a specific path I want to exclude - just a directory name if that makes sense.