I have noticed that when my washer cycle is finished and I open the lid while its finishing the spin cycle I can hear water under the steel drum as if it is not drained all the way. This is driving me nuts and even though I leave the door open when not in use it still gets a mildewy smell. I have physically drained the hose out once before and the smell was gross. I don't know if this is a pump issue or something else.
What can cause it and how do I fix it?