Bavarian Chevauleger Sword Clean up

[kibutz]

Hello I have a pre ww1 Kgl. Bayer. 1. Chevaulegers-Regt. Kaiser Nikolaus von Rußland
with burgundy Regimental facing color Sword, it has rust in it's blade and scarab. My question would be: How do I remove these rust spots from the etched blade and from the scabarb without damaging nor scratching the blade? Which products to use? How to clean it. Is there a proper technique? Would you use flitz cleaner?
I went to ace hardware and they recommended NEVER DULL (a mild antique cleaner), I decided to wait and ask the community.
After cleaning what should I do to maintain the sword in good condition?
Since the sword is so rare and entrusted to my care, for I'm it's 3 caretaker, I must make no mistakes while cleaning it. Thank you in advance for your help.

[rbminis]

I would be VERY careful when using never-dull near the etching. Not so much of a problem on the blade surface, but NOT on the etching. Most here will recommend Ren wax. Flitz is also a good product, but remember it is a polish and will remove material. But for sure, before you do anything, wait for others on this forum to chime in.

[SCHUPO]

Do NOT use polish on the colored portion of the blade as it will remove it. Only polish the un-etched portion of the blade or you will damage any blueing, gilt, etc in the etch.