Given there are cases of sudden onset autism being resolved with antifungals, it’s at least not implausible that fecal transplants could be effective too.
There’s some research on sudden onset autism being treated with antifungals; so at least sometimes a sudden change may be the result of something very specific in the gut.
The materials in a solar panel are recyclable, but practically speaking it’s extremely difficult since they’re epoxied together. There’s also the issue of heavy metal content like cadmium.