diff --git a/justfile b/justfile
index 1354ff2..0680c3a 100644
--- a/justfile
+++ b/justfile
@@ -19,3 +19,7 @@ update-package package:
 
 diff:
     nvd diff /run/current-system/ ./result
+
+clean:
+    sudo nix-collect-garbage --delete-older-than 30d
+    nix-store --optimise