diff --git a/ReadCache.pm b/ReadCache.pm
new file mode 100644
index 0000000..9addf02
--- /dev/null
+++ b/ReadCache.pm
@@ -0,0 +1,21 @@
+package readcache;
+use strict;
+
+# Read the archive directories.
+our %archives;
+
+sub readDir {
+    my $dir = shift;
+    opendir(DIR, "$dir") or die "cannot open `$dir': $!";
+    my @as = readdir DIR;
+    foreach my $archive (@as) {
+        next unless $archive =~ /^sha256_/ || $archive =~ /\.nar-bsdiff$/ || $archive =~ /\.nar\.bz2$/;
+        $archives{$archive} = "$dir/$archive";
+    }
+    closedir DIR;
+}
+
+readDir "/data/releases/nars";
+readDir "/data/releases/patches";
+
+print STDERR scalar (keys %archives), "\n";
diff --git a/print-dead-files.pl b/print-dead-files.pl
new file mode 100755
index 0000000..5f3c0a3
--- /dev/null
+++ b/print-dead-files.pl
@@ -0,0 +1,58 @@
+#! /var/run/current-system/sw/bin/perl -w -I .
+
+use strict;
+use Nix::Manifest;
+use ReadCache;
+use File::Basename;
+
+
+# Read the manifests.
+my %narFiles;
+my %patches;
+
+foreach my $manifest (@ARGV) {
+    print STDERR "loading $manifest\n";
+    if (readManifest($manifest, \%narFiles, \%patches, 1) < 3) {
+#        die "manifest `$manifest' is too old (i.e., for Nix <= 0.7)\n";
+    }
+}
+
+
+# Find the live archives.
+my %usedFiles;
+
+foreach my $narFile (keys %narFiles) {
+    foreach my $file (@{$narFiles{$narFile}}) {
+        $file->{url} =~ /\/([^\/]+)$/;
+        my $basename = $1;
+        die unless defined $basename;
+        #print STDERR "GOT $basename\n";
+        $usedFiles{$basename} = 1;
+        print STDERR "missing archive `$basename'\n"
+            unless defined $readcache::archives{$basename};
+    }
+}
+
+foreach my $patch (keys %patches) {
+    foreach my $file (@{$patches{$patch}}) {
+        $file->{url} =~ /\/([^\/]+)$/;
+        my $basename = $1;
+        die unless defined $basename;
+        #print STDERR "GOT2 $basename\n";
+        $usedFiles{$basename} = 1;
+        die "missing archive `$basename'"
+            unless defined $readcache::archives{$basename};
+    }
+}
+
+
+# Print out the dead archives.
+foreach my $archive (keys %readcache::archives) {
+    next if $archive eq "." || $archive eq "..";
+    if (!defined $usedFiles{$archive}) {
+	my $file = $readcache::archives{$archive};
+        print "$file\n";
+	my $hashFile = dirname($file) . "/.hash." . basename($file);
+	print "$hashFile\n" if -e $hashFile;
+    }
+}
diff --git a/remove-dead-files.sh b/remove-dead-files.sh
new file mode 100644
index 0000000..c576d63
--- /dev/null
+++ b/remove-dead-files.sh
@@ -0,0 +1,4 @@
+#! /bin/sh 
+./print-dead-files.pl /data/releases/patches/all-patches $(find /data/releases -name MANIFEST | grep -v '\.trash' | grep -v '\.tmp') | sort > /tmp/dead
+mkdir -p /data/releases/.trash/
+xargs -d '\n' sh -c 'find "$@" -mtime +100 -print' < /tmp/dead | xargs -d '\n' mv -v --target-directory=/data/releases/.trash/