I've been 'doing up' a mates (air/oil cooled,) Yamaha Diversion XJ600. The bike was in a flood and as such the engine was filled with water.
The bike's engine was emptied, a new oil filter & oil change was done (by the owner,) however, the oil is all 'milky' again (caused by condensaition still in the engine I presume

)
What do I need to do prior to changing the oil & filter again to get rid of the remaining water/condensation in the engine prior to doing another oil change

Is there an engine flush product that would do the engine some good prior to changing the oil
HELP!
P.S. the bike is all done & ready for MOT, just needs the oil sorting out first