30-Dec-2018, 00:03
(29-Dec-2018, 20:30)Jean-Marie Wrote: It is most probably a bit of dirt.
This video shows how to clean it: https://m.youtube.com/watch?v=hRwBMqYedZQ
Best regards
Jean-Marie
PS. I have no affiliation with the authors of the video.
Thanks...likely some food crumbs...(I'm hoping) so will check the video out.