@realDonaldTrump didn't actually propose injecting people's lungs with disinfectant. The idea of using disinfectant was clearly meant as an analogy -- hence the words "something like". Important to be fair, so that criticism hits home more when it is justified.

That said, it was still a characteristically loopy contribution to coronavirus thinking: the analogy was not exactly helpful, and it's quite weird that he seems to believe that his off-the-cuff remarks are helpful to scientists.