I have used muriatic acid bought from my hardware store, ( liquid not a gel ) on my awlgrip'd sailboat ( actually Awlcraft 2000 ) and it took off a yellow haze that I thought was permanent with no negative effect. I brushed in on my entire hull and within a few minutes spray with H20 to remove. I waxed the hull and it looks like the day I sprayed it ( less some mooring rash ! ).
With that being said, I would try it in a very inconspicuous area 1st. I am by no means an authority on this. I heard from someone it was safe and I did it with no issue at all.
As an aside - I used this same acid on all my stainless steel and it made it look NEW - too.
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