I don’t have a solution, but share in your grief! I have the same problem with my diswasher, made by Americana. I think it’s a cheapie brand the landlord installed. Nevertheless, I typically wouldn’t use it but I find when I don’t for some reason water collects in there and then that rotting flesh smell happens… So for now the solution is to run it about once a week, and that seems to eliminate the water from collecting in there. BTW, where are the drain and filter parts located that you mentioned cleaning? I sure hope another ask-publicite can MacGyver this for us!!