Ref. Battery goes flat overnight

Hi guys spoke to you last week and was instructed to disconnect alternator while haveing amp-meter on battery to watch for drop but still showed 2.5 amp drain so did the same with starter motor but still 2.5 amp drop. I have found that if I take the fuse from no1 in engine fuse box it returns to 0.6 amp as before have taken each fuse out in turn from car fuse box with amp meter on but have had no drop in voltage. On battery. Have you any more things I could try as it is driveing me mad. As I have to disconnect the battery every night. THANKS GUYS TONY.M.