just use subdir clean rules for unsorted examples build

unsorted/Makefile

@@ -31,4 +31,13 @@ all:
 	fi
 
 clean:
-	git clean -dxf .
+	for d in $(EXAMPLES_SUBDIRS); do \
+		echo "Making examples in $$d"; \
+		$(MAKE) $(AM_MAKEFLAGS) -C $$d -f Makefile.examples clean || exit 1; \
+	done
+	if pkg-config --exists eolian-cxx ; then \
+		for d in $(CXX_EXAMPLES_SUBDIRS) ; do  \
+			echo "Making examples in $$d"; \
+			$(MAKE) $(AM_MAKEFLAGS) -C $$d -f Makefile.examples clean || exit 1; \
+		done \
+	fi