Oh Hi Mark,
To remove configuration, you generally read the commands from right to left and negate the first word with an obvious counterpart (IE add/delete, configure/unconfigure, enable/disable).
For meters, there is a 'create' and 'configure', and this meter is referenced in your ACLs. So to undo, unconfigure the ACLs and delete the meters. No need to unconfigure the meter if you're going to delete it.
unconfigure access-list <ACL>
delete meter <meter>
Hope that helps!