million dollar question:how i can clean makrolon wrist?

[birox]

Ciao, i've a makrolon GP that have some white spot on bracelet.
I don't know the origin of it, but clear alcool don't remove it.
I will be try with some other product,but my fear is to damage it.
Someone have experience of it? Thanks

[rewolf]

Here are some hints: http://www.sheffieldplastics.com/web_docs/MakrolonCleaning.pdf
Makrolon is Polycarbonate, so any Polycarbonate cleaner will at least not harm it. I guess it depends mainly on what that white spot is made of.