I have just bought a second hand Hoover 4002 551 shampoo and polisher, I think it has all the bits but no user guide. I plug it in and off it goes, easy except i cant seem to get the water through so obviously have to do something but don't know what is there anyone out there who has one and can tell me how to use it, or better yet email a user guide, I have emailed hoover direct but they don't have one, which is useful to say the least.