— Command: tramp-cleanup-connection vec

This command flushes all connection related objects. vec is the internal representation of a remote connection. Called interactively, the command offers all active remote connections in the minibuffer as remote file name prefix like /method:user@host:. The cleanup includes password cache (see Password handling), file cache, connection cache (see Connection caching), connection buffers.

— Command: tramp-cleanup-this-connection

This command flushes all objects of the current buffer's remote connection. The same objects are removed as in tramp-cleanup-connection.

— Command: tramp-cleanup-all-connections

This command flushes objects for all active remote connections. The same objects are removed as in tramp-cleanup-connection.

— Command: tramp-cleanup-all-buffers

Like in tramp-cleanup-all-connections, all remote connections are cleaned up. Additionally all buffers, which are related to a remote connection, are killed.