Be more selective about what containers get deleted.

Makefile

@@ -71,10 +71,16 @@ coverage:
 
 # Clean up environment
 clean:
-	# Clean up Docker environment
+# Clean up Docker environment
 	docker-compose down
-	-docker images -aq | xargs docker rmi
-	docker system prune --volumes -af
+# remove nrao: labeled containers
+	@docker container list --all | grep nrao: | awk '{ print $$1 }' | xargs docker container rm -f
+# remove workspaces and nrao labeled images
+	@docker images | grep 'workspaces\|nrao' | awk '{ print $$3 }' | xargs docker rmi -f
+# remove the python egg-info and pytest_cache folders
+	@find . \( -name "*.egg-info" -o -name ".pytest_cache" \) -exec rm -r {} \;
+
+# Clean things up in a very nasty and destructive way that is sure to derail the rest of your afternoon
+reallyclean: clean
+	docker system prune --volumes -f
 	docker volume prune -f
-	# Delete Python cache directories
-	find . \( -name "*.egg-info" -o -name ".pytest_cache" \) | xargs rm -r