Voici la reponse du support :
Hello,
Thank you for contacting Elegoo Technical Support. This is Steven form Elegoo Technical Support team.
We apologize for the delay in our reply.
I'm very sorry to inform you that this issue cannot be restored. We do not recommend using resin cleaning solution, alcohol, or IPA directly on plastic parts, as they can easily react with the material and cause damage.
At this point, the only solution is to polish the surface. If there is a PVC sticker on the touchscreen, you could try removing it to see if that improves the appearance.
I hope this information helps.
Best regards,
Steven
Elegoo Technical Support
Je suis un peu désabusée et j'aimerais leurs répondre sans les insulter mais mon anglais est trop mauvais...