For scrubbing I might suggest that bronze wool is preferable to steel wool. The bronze is unlikely to damage the steel or iron of the shield. Everyone seems to have their own preference of oil with which to scrub. When I wished to avoid getting oil on another part I have used hard paste wax, maybe not the best but not harmful. Automatic transmission fluid is a good cleaning agent.
Coca Cola has maybe 5% phosphoric acid, which is a good rust remover and which also inhibits iron corrosion.
Vinegar (acetic acid) or various citric acids do no inhibiting. Avoid steel wool.
Coca Cola may dissolve the enamel on your teeth, not sure about other bodily effects . . . been used for decades as a good rust remover, though.
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