diff --git a/CleanSpec.mk b/CleanSpec.mk
index b12200e..44cb05e 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -87,6 +87,9 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/APPS/*)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/YouTube*)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/*)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/APPS/*)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
 
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libstagefright_intermediates)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libstagefright_omx_intermediates)
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 6fa330d..986dac9 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -53,7 +53,7 @@
   # intermediate builds).  During development, this number remains at the
   # SDK version the branch is based on and PLATFORM_VERSION_CODENAME holds
   # the code-name of the new development work.
-  PLATFORM_SDK_VERSION := 12
+  PLATFORM_SDK_VERSION := 13
 endif
 
 ifeq "" "$(PLATFORM_VERSION_CODENAME)"