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Re:Nasa’s Mars Rover Opportunity Concludes a 15-Year Mission by mturmon on Wednesday February 13, 2019 @07:12PM (#19158455)
Yes. For more:

https://en.wikipedia.org/wiki/Cleaning_event

and:

https://www.jpl.nasa.gov/missions/mer/images.cfm?id=1823

The second link shows about 18% power drop after 90 sols ~= 90 days.

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