Your best action would have been to check the manufacturer's website for cleaning methods before you started, specifically the soldering and handling instructions:
http://www.cree.com/led-components/media/documents/XLamp_XT_SH.pdfRecommended Cleaning solutions
Cree has found the following chemicals to be safe to use with XT Family LeDs.
• Water
• Isopropyl alcohol (IPA)
Chemicals Tested as Harmful
In general, subject to the specifics in Cree’s Chemical Compatibility Application Note, Cree has found certain chemicals to be harmful to
XT Family LeDs. Cree recommends not using these chemicals anywhere in an LeD system containing XLamp XT Family LeDs. The fumes
from even small amounts of the chemicals may damage the LeDs.
• Chemicals that might outgas aromatic hydrocarbons (e.g., toluene, benzene, xylene)
• Methyl acetate or ethyl acetate (i.e., nail polish remover)
• Cyanoacrylates (i.e., “Superglue”)
• Glycol ethers (including Radio Shack ® Precision electronics Cleaner - dipropylene glycol monomethyl ether)
• Formaldehyde or butadiene (including Ashland ® PLIOBOND ® adhesive)
It sounds as if you didn't use sufficient passes of the IPA (hopefully it was IPA) to completely remove the flux residue, if there was any left then, yes it would have gone cloudy again as it dried. I think the Acetone will have softened the plastic and permanently crazed the surface. I doubt if Dremmels feature anywhere in the proper handling procedures
- best case, you will change the lens profile, it would be advisable to short each one to avoid static damage too.
I'd say, at this point, you'd be best off replacing them.