After-Can't say I did a good job, lol.
No oil or wax added yet, still looking for good suggestions.
I see some green poking through now!!
I've used the Renaissance Wax which gives a nice sheen to the helmet and darkens down th eorange rust and also seems to bring some life back into the faded paint.
Jeez, i wouldn't touch electroysis on thin helmet steel, you might just eat the whole shell away. From what i've read using electrolysis on a helmet with a decal will pretty much mean you lose the decal as the layer of rust that the decal is sitting on will lift from the remaining steel base layer. I looked at trying electolysis but it seems to be more suitable for solid metal items like engine parts/rifle barrels etc.
You're welcome my friend!
Oxalic seems to work better on lighter rust, just a couple of weeks ago I put a lightly rusted neckchain from my Feldgendarmerie gorget into an oxalic solution and within 15 minutes the rust had melted away and only fresh bare metal and original silver paint were left on the chain, it was brilliant! Crusty old helmets are a tougher ask but don't give up, your lids certainly looked better, just not dramatically so. Good luck!