x2 on the 50/50 vinegar and water.
or if you can get it..50/50 beet juice and water
both will take an enourmous amount of crud out.
let it soak...
or cycle if you have an electric water pump with the t-stat out..
on the refill definately distilled water.. $0.99 at the grocery store for a gallon.
fwiw.
cheapst.