Stuart h

My wife has got a citroen c3 she loves the car to bits so much so she has spent a fortune on it with a full engine rebuild new gearbox new clutch I could go on all day BUT now she has got a problem with a fuse box some how it has got wet I was told to dry it and get all new fuses but now the battery keeps draning over night dose someone have any ideas what I could try or do next plz