diff --git a/tools/utils_maintenance/code_clean.py b/tools/utils_maintenance/code_clean.py
index 77f8d0d9e94..d5cb667fdb6 100755
--- a/tools/utils_maintenance/code_clean.py
+++ b/tools/utils_maintenance/code_clean.py
@@ -1874,29 +1874,35 @@ def wash_source_with_edit(
                 pass
 
 
+class FileBuildConfig(NamedTuple):
+    build_args: Sequence[str]
+    build_cwd: str | None
+    output_path: str
+
+
 def wash_source_with_edit_list(
         source: str,
-        output: str,
-        build_args: Sequence[str],
-        build_cwd: str | None,
+        build_configs: Sequence[FileBuildConfig],
         skip_test: bool,
         verbose_compile: bool,
         verbose_edit_actions: bool,
         shared_edit_data: Any,
         edit_list: Sequence[str],
 ) -> None:
-    for edit_to_apply in edit_list:
-        wash_source_with_edit(
-            source,
-            output,
-            build_args,
-            build_cwd,
-            skip_test,
-            verbose_compile,
-            verbose_edit_actions,
-            shared_edit_data,
-            edit_to_apply,
-        )
+    assert len(build_configs) > 0
+    for build_cfg in build_configs:
+        for edit_to_apply in edit_list:
+            wash_source_with_edit(
+                source,
+                build_cfg.output_path,
+                build_cfg.build_args,
+                build_cfg.build_cwd,
+                skip_test,
+                verbose_compile,
+                verbose_edit_actions,
+                shared_edit_data,
+                edit_to_apply,
+            )
 
 
 # -----------------------------------------------------------------------------
@@ -1988,18 +1994,32 @@ def run_edits_on_directory(
                         return True
         return False
 
-    # Filter out build args.
-    args_orig_len = len(args)
-    args_with_cwd = [
-        (c, *split_build_args_with_cwd(build_args_str))
-        for (c, build_args_str) in args
+    filepaths_unique = {c for c, _ in args}
+
+    # Filter out paths.
+    # NOTE: the same source file may be referenced from multiple `build_args`,
+    # when running multiple processes it's important that each file references all it's arguments,
+    # so different processes don't try to manipulate the same file at once.
+    args_from_file_map: dict[str, list[FileBuildConfig]] = {
+        c: []
+        for c in sorted(filepaths_unique)
         if test_path(c)
-    ]
+    }
+
+    for (c, build_args_str) in args:
+        if c not in args_from_file_map:
+            continue
+        build_args, build_cwd = split_build_args_with_cwd(build_args_str)
+        args_from_file_map[c].append(FileBuildConfig(
+            build_args=build_args,
+            build_cwd=build_cwd,
+            output_path=output_from_build_args(build_args, build_cwd),
+        ))
+
     del args
-    print("Operating on {:d} of {:d} files...".format(len(args_with_cwd), args_orig_len))
-    for (c, build_args, build_cwd) in args_with_cwd:
+    print("Operating on {:d} of {:d} files...".format(len(args_from_file_map), len(filepaths_unique)))
+    for c in args_from_file_map.keys():
         print(" ", c)
-    del args_orig_len
 
     if jobs > 1:
         # Group edits to avoid one file holding up the queue before other edits can be worked on.
@@ -2019,26 +2039,22 @@ def run_edits_on_directory(
             if jobs > 1:
                 args_expanded = [(
                     c,
-                    output_from_build_args(build_args, build_cwd),
-                    build_args,
-                    build_cwd,
+                    build_configs,
                     skip_test,
                     verbose_compile,
                     verbose_edit_actions,
                     shared_edit_data,
                     edits_group,
-                ) for (c, build_args, build_cwd) in args_with_cwd]
+                ) for c, build_configs in args_from_file_map.items()]
                 pool = multiprocessing.Pool(processes=jobs)
                 pool.starmap(wash_source_with_edit_list, args_expanded)
                 del args_expanded
             else:
                 # now we have commands
-                for c, build_args, build_cwd in args_with_cwd:
+                for c, build_configs in args_from_file_map.items():
                     wash_source_with_edit_list(
                         c,
-                        output_from_build_args(build_args, build_cwd),
-                        build_args,
-                        build_cwd,
+                        build_configs,
                         skip_test,
                         verbose_compile,
                         verbose_edit_actions,