It's L, dagnabbit.

Change-Id: Ied4e6fce1464aa5cd012a5e2519df8462ec91b4c
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 4eec704..f8d0e6f 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -234,6 +234,11 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/*)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/APPS/*)
 
+# L development
+$(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
 # ************************************************