Hi Ruut
I had the same problem with our Plus Six after driving on a newly sealed road when large chips on wet tar seal flew up. Apparently the front wings on t least our 2020 Plus Six were not undersealed but the rear wings were. I've since had the fronts undersealed and no further problems.
Kerry


2019 First Edition Plus Six Moonstone Blue
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2017 Plus 4 Auto Ivory
2011 4/4 Grey
1939 4-4 Blue