well- acetate is not a stable fabric and over time it gets rigid and will actually disintegrate/shred...
this is why it is only used as a lining and not as an outerlayer...
too much friction will cause it to fall apart...
and i think i remember that even sunlight will break down the fibre and fade the colour...
crazy right?!
i guess that is why you hardly see it used nowadays...
i have seen this happen with vintage things---especially at the seams...
but i think that if you gently hand soak you will be ok...
and roll in a towel and lay flat to dry...
i couldn't swear to it, but i would risk it if it were my thing...
i'll be curious to see what you wind up doing?!
i had two pairs of sunglasses adjusted yesterday---
one of them being my vintage raybans from the 80's...
rah rah!!!
going to bring them back to replace my cool sunglasses which were lost...