diff --git a/scripts/render.sh b/scripts/render.sh
old mode 100755
new mode 100644
index 64c712c..186be8d
--- a/scripts/render.sh
+++ b/scripts/render.sh
@@ -515,6 +515,26 @@ main() {
         cd - > /dev/null
     fi
 
+    # Clean output directory before rendering (preserve .git only)
+    # This prevents stale files from old runs accumulating
+    if [[ "$DRY_RUN" != "true" ]]; then
+        local stale_count=0
+        for item in "${OUTPUT_DIR}"/*; do
+            [[ -e "$item" ]] || continue
+            rm -rf "$item"
+            stale_count=$((stale_count + 1))
+        done
+        # Also remove hidden files except .git
+        for item in "${OUTPUT_DIR}"/.[!.]*; do
+            [[ -e "$item" ]] || continue
+            [[ "$(basename "$item")" == ".git" ]] && continue
+            rm -rf "$item"
+        done
+        if [[ $stale_count -gt 0 ]]; then
+            log_info "Cleaned ${stale_count} item(s) from output directory"
+        fi
+    fi
+
     # Render each customer
     local success_count=0
     for customer_file in "${customer_files[@]}"; do