Best way to clean a chain?

[metbandit1]

Ok so ive ridden my bike through most of winter regularly cleaning/lubing the chain. But even with my regular regime in the past week it has become really rusty. what the best way to clean all of the rust off of the chain?
i dont want to have to buy a new chain early if this has anoter 10000 miles in it

 

[metbandit1]

ill try the WD 40 then and see how it goes

my regime usually works but i think its because i cleaned/lubed it and then rode it in the wet and left it for 2 weeks. which caused it.