diff --git a/justfile b/justfile
index 2120c58..0040932 100644
--- a/justfile
+++ b/justfile
@@ -63,5 +63,5 @@ deploy host remote=host:
     nixos-rebuild switch --flake .#{{host}} --target-host {{remote}} --sudo --ask-sudo-password
 
 # garbage collect old generations
-clean:
-    sudo nix-collect-garbage $(nix eval --raw -f ./nix.nix nix.gc.options)
+clean host=`hostname`:
+    sudo nix-collect-garbage $(nix eval --raw .#nixosConfigurations.{{host}}.config.nix.gc.options)
diff --git a/nix.nix b/nix.nix
deleted file mode 100644
index c2dff0d..0000000
--- a/nix.nix
+++ /dev/null
@@ -1,33 +0,0 @@
-{
-  nix = {
-    settings = {
-      experimental-features = [
-        "nix-command"
-        "flakes"
-      ];
-      download-buffer-size = 2 * 1024 * 1024 * 1024;
-      warn-dirty = false;
-      substituters = [
-        "https://cache.nixos.org"
-        "https://nix-community.cachix.org?priority=45"
-        "http://tower:5000?priority=50"
-      ];
-      trusted-public-keys = [
-        "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
-        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
-        "matej.nix-1:TdbemLVYblvAxqJcwb3mVKmmr3cfzXbMcZHE5ILnZDE="
-      ];
-    };
-
-    gc = {
-      automatic = true;
-      dates = "monthly";
-      options = "--delete-older-than 30d";
-    };
-
-    optimise = {
-      automatic = true;
-      dates = [ "monthly" ];
-    };
-  };
-}