I've found the magic prop protection product!!

[Firefly625]

I'm glad that's over, twas a long night standing by, done a few dog watches in my time, but that was ridiculous

I am so sorry, there was really nothing I could do...

 

[Marine Reflections]

Once you have a highly polished prop, you want to keep it that way and not scratch it up, also to leave a product of that acidity will not do the prop much good, again as Daka points out.

Once polished, some Meguiars Marine Metal Guard will help protect even longer, but as always, condition beats product every time.