I haven't tried this yet (and few posts here about it) but the guys on the Surplus Rifles/Enfield forum have 9 pages of it...and it looks pretty good...
http://www.surplusrifleforum.com/vie...p?f=80&t=62728
Cheap materials, battery charger from everyone's garage, supermarket chemicals...
Supposedly leaves bluing untouched...
I'm eager to try it...but don't have anything really rusty...