There are a number of pay tools that can remove metadata (you can just google metadata removal) in bulk from files, but Microsoft has a tool that can remove metadata from one file at a time. The Microsoft tool is free. You can obtain the free tool here:
Run the file your download and it will install an add-in to your Office programs. Here are Microsoft's instructions on using the tool:
After you install the Remove Hidden Data add-in, open the document you want to review then, on the File menu, click Remove Hidden Data.
Note: If you do not see the Remove Hidden Data command on the File menu, check the following:
1. On the Tools menu, point to Options, and then click the Security tab. 2. Under Macro Security, click Macro Security.
3. Click the Trusted Publishers tab.
4. Select the Trust all installed add-ins and templates check box, and then click OK twice.