OK.. just have to say... I know not related to the original post... but OH MY GOODNESS... I have clean oven racks!! Soaked em for 3 1/2 hrs and they just wiped clean! (yes I was impatient) Admittedly they're not 100%, still just a few stubborn spots, but I have no doubt if left overnight there'd be no wiping to do!! I had to do a bit of a scrub with my enjo and the fiddly bits were harder to get into... but they are so so so so so much cleaner already. V excited! hehehe. Now to do the oven.