How to FULLY remove metadata (author, file location, etc) of a PDF to really make it anonymous?

Here is an example: when creating a PDF from, e.g., using TextEdit and "Print > Save as PDF",

the dialog box gives the possibility to change or remove the authors.

However, other informations such as the location of the file are written in the PDF file,

and this can be an easy way to identify the author.

... and opening the PDF file using Adobe Reader and going to File > Properties > Description

you can see this location (which display the full path and, e.g., your login if it is used in the path).

Location is just one example and perhaps there are other problems like that (?)

So, is there a robust way to remove ALL the metadata from a PDF file *** indepently on how it was generated *** ?

Thanks for your help!

Pierre

PS: There several discussions on this topic but I haven't found the answer to solve the problem globally