if you leave them in there for long times all the times they will come out with blackdots! and only a mould killer can get rid of it. how do i know? because it happens to me allllllll the time! and plus, humidity can make mould grow wether its wet or dry anyway! Anyhow, that smell is because the clothes are still yet. only the top layer drys. if you cant be assed getting them out, just flip the clothes upside down, so the wet ones end up on top, so they can dry out. i do this when i do a late night wash and have to run off somewhere in the morning. Just go flip them till your ready or have time to do the job properly!