diff --git a/builds/rebuild.nix b/builds/rebuild.nix
index 97c2968..5b02f99 100644
--- a/builds/rebuild.nix
+++ b/builds/rebuild.nix
@@ -19,6 +19,7 @@ stdenv.mkDerivation rec {
     mkdir -p $out/bin
     cp $src/rebuild $out/bin
     cp $src/git-rebuild $out/bin
+    cp $src/nix-sanitation $out/bin
     wrapProgram $out/bin/rebuild --prefix PATH : ${lib.makeBinPath [ bash ]}
   '';
 
diff --git a/builds/rebuild/nix-sanitation b/builds/rebuild/nix-sanitation
new file mode 100755
index 0000000..1f8713e
--- /dev/null
+++ b/builds/rebuild/nix-sanitation
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+printf "clearing out nix caches\n"
+
+sudo nix-collect-garbage -d
+nix-collect-garbage -d
+sudo nix-store --optimize