any halal whey protein user? mind telling me one?

yes, shiloong, you're right. halal is more than just the source. it includes the way of preparation. if the machines have been used to process other non-halal food(especially comes from non-halal meat/fat), then the same machines use to process new foods, even the sources is now halal, but still the processed foods don't certified as halal foods due to machines before have been used to processed non halal sources.

how to clean the machines so that it could be used to produced halal foods?well, if u really want to know, i can explain it too, but for intro, the name of the process to clean the machines is called 'samak'.

apparently most of the factories do. anyway, alcohol can be touched but can't be drink, and there's some explanations about alcohol too.
about whey protein, what makes it non-halal is the gelatine that is derived from animal stuff.
but there are some factories that produces halal whey protein too,i just found it few weeks back.

its called WO protein(their page), officially certified by JAKIM, there is also a popular Ultimate nutrition prostar 100% whey protein that have been certified by ifanca(america halal agency), but only the natural flavour is certified, and badly, the certified ended just this May/March(nt sure), not sure if they've renew the certificate though. maybe you can call them if you want to know if they've updated it.