Shhhhhhh!!!

Change-Id: I3bb72742f788c70f82f311b6ffba479aa02a1eb0
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 3918fce..025edb0 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -289,6 +289,11 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/root/default.prop)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/recovery/root/default.prop)
 
+# API 21?
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/*)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/APPS/*)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************