Yes. For more: https://en.wikipedia.org/wiki/Cleaning_event https://en.wikipedia.org/wiki/Cleaning_event and: https://www.jpl.nasa.gov/missions/mer/images.c

Yes. For more: https://en.wikipedia.org/wiki/Cleaning_event https://en.wikipedia.org/wiki/Cleaning_event and: https://www.jpl.nasa.gov/missions/mer/images.cfm?id=1823 https://www.jpl.nasa.gov/missions/mer/images.cfm?id=1823 The second link shows about 18% power drop after 90 sols ~= 90 days.