How Does One Reset a Node?

Throughout my development process, I need to reset nodes to either re-cluster, or use for different purposes. How does one reset the “galera” cluster state? Regardless of what I do, the grastate.dat file is always populated with the last cluster information (seqno, etc).

Is there any command or set of commands one can run to reset a node to forget about its last clustering? “RESET MASTER”, “flush-logs”, etc?

It is as simple as just deleting the file? Are there other files that must be removed/reset/etc?