Corrosive ammo is not really a problem. It is just that you have to clean your rifle when you get home from the range.
Running a patch or two down the bore with windex on them is not going to cut it!
That is unless you have a bolt action rifle.
With a semi auto rifle you have to feild strip the rifle and clean all the parts that gas comes into contact with. Bolt,bolt carrier,inside the receiver,all gas system parts,and the barrel. Even the muzzle brake. I have been using CLP to clean and protect all my firearms since the late 1980's. It works real good on the corrosive residue from corrosive ammo. It doesn't disolve the corrosive residue but takes it into solution so it can be rinsed out with brake parts cleaner.
This is how I clean AK/SKS rifles. I use CLP on all my firearms. I don't know the size of the gas tube on a Romak III so you will have to figure that out for yourself.
Go to Wal-mart and get from these depts.
Sporting goods dept.
A pump spray bottle of Break-Free CLP www.break-free.com/
A 30cal and a 20 gauge bore brushes
Automotive dept.
A can of brake parts cleaner
A set of brushes or brush with brass or steel brissles. like this
www.woodcarvingstore.com/RotaryToolAccessories/CleaningBrushes.asp
Housewares dept.
roll of paper towels
Drug dept.
A new tooth brush.
When you get home swap out your new tooth brush for your old one.Spray down all the parts of your rifle with CLP and let it sit for 15 minuites. Use your old tooth brush to scrub the inside of the receiver and parts. Use the brass/steel brush on the gas piston. It will take several applications of CLP and scrubbing to get heavy amounts of carbon off the gas piston. A wire wheel in a electric drill can be used to cut down on the amount of scrubbing needed. Use the 30cal brush on the bore and the 20 gauge brush on the gas tube/gas block. Once clean put 4 paper towels in the bottom of the bag you brought the stuff home from Wal-mart in. Hold the parts over the bag and use the brake parts cleaner to rinse everything off. Brake parts cleaner removes everything and leaves no residue. Spray a 4"x4" piece of rag and one patch with CLP. Rub the rag on every part inside and out to lube/protect it and run the patch through the bore. Put the rag and patch in a zip lock bag to use the next time you clean your rifle. Make sure to wipe the gas piston and the inside of the gas tube and gas block. The CLP will get into the pores of the metal and not let the carbon stick tight. So the next time you clean your rifle the brass/steel brissle brush will not be needed only the tooth brush. Take the bag with the paper towels which have absorbed all the brake parts cleaner and dirt outside or in the garage to let the bpc evaporate then throw it away.
The only thing I can add concerning cleaning a Romak III would be to get a GI M-16 long receiver cleaning brush to do the muzzle brake with.
www.amerisurp.net/misc_cleaningkit.htm