Misting in the sun is a symptom of the presence of condensed water down below, which could do damage in the long run. The sun heats the lower parts of the dash as it falls on the dark instrument face, and the evaporated moisture then condenses on the lower side of the clear cover, which remains cool. It's a kind of greenhouse effect. The continued presence of the liquid water reservoir below is what's worrying.
As Pete said, removing the clear cover won't help much. Also as he said, newer bikes like yours may be better protected by a membrane. Doing a really good fix may be a lot of trouble.