I seem to have a storage issue on my Google Drive.
The storage used indicated on the home page, visible on the image below, is 5x larger than the storage used on my Home folder calculated with this application: http://gdrivefoldersize.appspot.com/.
I looked for large files through the 'quota' page, accessible with the 'i' button on the image. Some were old files which I thought I deleted, and which I cannot locate on my drive (example on the left in the image below). Their location is not indicated, and there is even an 'add to my drive' option available. But they seem to take up space on my drive nevertheless.
My trash is empty.
How do I locate and clear these files from my drive?