I just cleaned the dashboard indicators glass It was foggy, or rather, as I red in another thread, there could be some fungus in there I found there is no seal on around the glass, so any air could enter (and does, as this is the way the pcb cooled) Here is how dashboard looked before: Here is the complete DIY link, both in romanian and english. It's a 2-3h job Prius gen3 remove-clean dashboard / demontare-curatare bord
I've done similar cleaning on two Gen 2s. It wasn't hard at all. Second time was easier, as you can imagine.
While you've got it open, I wonder, would tucking a small pack of silica gel (moisture absorbent) in somewhere, be practical/possible/effective?