You're not supposed to eat EZ-Off.....

We used WD-40 and elbow grease on our 16's, in '77, and it was against regs, then, too.
We cleaned all our weapons in the armory, and they'd smell that WD and start raising hell.
We'd carry the little sqeeze packs in the field, then the gunny would get mad when it sprayed out of the chamber. He'd let up, though, when he realized we'd bring 'em back cleaner than when we saddled up.

To this day, I hate tracer rounds because, while fun to fire, the cleaning is a beech.

Elbow grease still works, and I give the JROTC kids extra points for non-anodized brass and leather shoes.

And I still think Centurion.