The only way to know is to try. I've had good success with Maas on doors just like yours. Be gentle. There's nothing wrong with polishing something lightly a few times to achieve a result, over polishing very aggressively and taking off too much plating.
Protip: put a little dab of maas on the end of a q-tip or the end of a toothpick and work it into the grooves on the safety bars. Works great to remove old dinge.
Hope it helps,
-- Chet
On the wrist this week: Fortis Millenium Starship Limited Edition Flieger Chrono in Valjoux 7750
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