Washer doesn't drain completely. Mildewey or
It sounds like you have some debris or gunk in your drain system. You can clean the system out by first unplugging the machine, turning off the water supply and disconnecting the hoses. You'll then need to take the back off the machine and will probably need to tip it on its front. There will be water that spills onto the floor, so it's helpful to have some towels on hand.
At the bottom of the drum, you'll see a funnel-shaped elbow that's probably black rubber, leading to a pump and from that, a smaller plastic hose leading to the upper corner of the machine where it connects to another plastic hose that goes to the drain. You'll need pliers (channel locks or vice grips are best) to take off the hose clamps and probably a small Phillips screwdriver to disconnect the drain section of the drain pump. Depending on where it is in the machine, you may be able to leave the pump in place and open the chamber on the back. You should be able to fish out foreign items (in my house it's lego people, 8 penny nails, change and batteries) without much trouble. Pump debris might be your only trouble. If, however, you wash a lot of dirty clothes (I'm a dairy farmer), you might need to de-gunk the funnel and plastic hoses as well. The funnel is big and easy. The plastic hoses are harder. They are crinkled so they'll bend and gunk hangs out in the crinkles. I fill the hoses with hot water and some dishwashing liquid and let them soak for 10 minutes. I made a cleaning tool by straitening a metal coat hanger and crimping a piece of a Scotch Brite sponge on the end. It's pretty much impossible to get them completely clean, but you can make a big improvement.
On the farm, I have to do this once or twice a year. I suspect normal people could go a lot longer. It's really not a big deal and takes about a hour, about the amount of time you would spend on hold trying to schedule a repair appointment.
Good luck!