diff --git a/makefiles/targets/sterile.mk b/makefiles/targets/sterile.mk
index c661f53..f5922ee 100644
--- a/makefiles/targets/sterile.mk
+++ b/makefiles/targets/sterile.mk
@@ -31,6 +31,7 @@
 ## -----------------------------------------------------------------------
 .PHONY: sterile
 sterile :: clean
+	$(if $(sterile-dirs),$(RM) -r $(sterile-dirs))
 
 ## -----------------------------------------------------------------------
 ## -----------------------------------------------------------------------
diff --git a/makefiles/targets/tox.mk b/makefiles/targets/tox.mk
index b3a638b..9d50962 100644
--- a/makefiles/targets/tox.mk
+++ b/makefiles/targets/tox.mk
@@ -28,6 +28,9 @@
 lint-tox: lint-jjb
 	tox -e py310
 
+sterile ::
+	$(RM) -r .tox#       # $(TOP)/.tox
+
 ## -----------------------------------------------------------------------
 ## -----------------------------------------------------------------------
 help-verbose += help-tox