I have posted this "strip wash" recipe before when someone had trouble with build up....

But this was in my instructions for my Fuzzi Bunz and I reckon it works really well for smells/stains/buildup and just an all round freshen up. It's a bit lengthy, so I save it for a slow day at home!

plain hot water wash (short wash on machine is enough)
warm wash with 1/2 cup vinegar and 1/2 cup bicarb soda
chuck an extra 1/2 cup vinegar in with rinse cycle
then do a 2nd rinse in plain cold water (this gets out the vinegar smell)

Hang in sun (if there is any of the day left LOL!)

Gotta love vinegar and bicarb - I buy it in bulk for loads of my cleaning.

Cheers.