diff --git a/cleanup.bash b/cleanup.bash
index fc48c6e..b310132 100755
--- a/cleanup.bash
+++ b/cleanup.bash
@@ -1,6 +1,50 @@
 #!/bin/bash
-rm *.mp3
-rm *.chapters.txt
-rm *.m4a
-rm *.ogg
-rm *.flac
+prefix=$1
+
+if [ -z $prefix ]
+then
+	echo "Must specific a prefix."
+	exit 1
+fi
+
+function clean_old() {
+	prefix=$1
+	ext=$2
+	to_keep=$3
+	ls $prefix*$ext 1> /dev/null 2>&1
+	clean=$?
+	count=0
+	if [ 0 -eq $clean ]
+	then
+		for file in $(ls -r $prefix*$ext)
+		do
+			if [ $count -lt $to_keep ]
+			then
+				count=$((count + 1))
+			else
+				rm $file
+			fi
+		done
+	fi
+}
+
+function clean_ext() {
+	ls $1*$2 1> /dev/null 2>&1
+	clean=$?
+	if [ 0 -eq $clean ]
+	then
+		rm $1*$2
+	fi
+}
+
+clean_old $prefix "wav" 2
+clean_old $prefix "mp3.xml.*" 1
+clean_old $prefix "m4a.xml.*" 1
+clean_old $prefix "ogg.xml.*" 1
+
+clean_ext $prefix "mp3" 
+clean_ext $prefix "chapters.txt" 
+clean_ext $prefix "m4a"
+clean_ext $prefix "ogg"
+clean_ext $prefix "flac"
+