Pinner says "Ok, I just tried this and it seriously did work. I did it twice on a burner that's had scorch marks for a year or more and they're gone! For anyone as OCD about cleaning as I am, this is a must!
It's time to clean your washing machine! Even if it's not visibly dirty and grungy, this will help clean soap scum and mineral deposits in the pipes and hoses. You just need vinegar, bleach, and two wash cycles!