各位好，我最近在处理Flutter项目时遇到了一个棘手的问题：每次执行flutter clean命令，都会提示多个目录无法删除，终端的完整输出如下：

C:\Users\salil\OneDrive\Documents\MEGA\Practicals\Flutter\myfirstflutter>flutter clean
Failed to remove C:\Users\salil\OneDrive\Documents\MEGA\Practicals\Flutter\myfirstflutter\.dart_tool.
A program may still be using a file in the directory or the directory itself.
To find and stop such a program, check for processes using the directory.
Deleting .dart_tool... 14ms
Failed to remove C:\Users\salil\OneDrive\Documents\MEGA\Practicals\Flutter\myfirstflutter\ios\Flutter\ephemeral.
A program may still be using a file in the directory or the directory itself.
To find and stop such a program, check for processes using the directory.
Deleting ephemeral... 5ms
Failed to remove C:\Users\salil\OneDrive\Documents\MEGA\Practicals\Flutter\myfirstflutter\linux\flutter\ephemeral.
A program may still be using a file in the directory or the directory itself.
To find and stop such a program, check for processes using the directory.
Deleting ephemeral... 7ms
Failed to remove C:\Users\salil\OneDrive\Documents\MEGA\Practicals\Flutter\myfirstflutter\macos\Flutter\ephemeral.
A program may still be using a file in the directory or the directory itself.
To find and stop such a program, check for processes using the directory.
Deleting ephemeral... 4ms
Failed to remove C:\Users\salil\OneDrive\Documents\MEGA\Practicals\Flutter\myfirstflutter\windows\flutter\ephemeral.
A program may still be using a file in the directory or the directory itself.
To find and stop such a program, check for processes using the directory.
Deleting ephemeral... 6ms

我已经尝试了这些方法，但都没解决问题：

• 用ProcessExplorer、File LockSmith和ResourceMonitor工具排查目录锁定进程，完全找不到相关的锁定项
• 重启笔记本电脑后再次执行flutter clean，错误依旧
• 检查了项目路径，确认没有空格、破折号这类可能引发问题的特殊字符

目前唯一能清理这些目录的方式是手动逐个删除，但每次都这么操作实在太繁琐了。我怀疑会不会是OneDrive同步在干扰——毕竟项目目录就在OneDrive的同步文件夹里，但不确定是不是这个原因。

有没有朋友遇到过类似的情况？或者有什么排查思路或解决方案可以分享？非常感谢！