I tried the trick I found on here the other day to clean the oven door with a dishwasher tablet. I then decided to try doing the shelves in the same way - put them in the sink (we have a big one so they can lie down in there), covered with hot water and chucked dishwasher tab in. 10 mins later I just wiped all the brown baked on stuff off with a sponge! Some light scrubbing to remove stubborn areas and now they are sparkling. So easy! Why has it taken me so long to realise this time-saver?!