Powder drawer – Help needed!!

Hi, My washing machine is leaking and best I can tell it is coming from what is a very gunked up powder/softner drawer. I know it is possible to remove and clean this drawer, however I do not have the instruction manual so do not know how to do it. I have been told by someone in a shop, that there should be a small plastic button somewhere about the drawer which will release it. I have been unable to find any such button. I have also tried to look for the ‘product code’ on the back of the machine, but can only find the model number, power information and a group of barcoded stickers. The machine is an Indesit WN 1063 WG. Any info on the drawer or ‘product code’ would be greatly appreciated. Thanks.