I'd just replace the crystals.
This ^^^Meguiar's Plastx, if willing to do a little polishing.
No, it was the question. You asked how to clean them. My answer stands. There is no intrinsic value to the originals.That was not the question and is besides the point if it is possible, with a little time, to clean the original crystal.
No, it was the question. You asked how to clean them. My answer stands. There is no intrinsic value to the originals.