I have experience with the MSR Dromedary bag, which I will assume uses the same coating as the dromlite. My suggestion is to do the things which will promote the leaching process. For example fill the bag with hot water and let it sit until it cools then empty and repeat. Also do the soaks suggested by MSR like soaking with vinegar overnight. Also store the bag sans cap in a ventilated manner to promote release of the the ‘stinky stuff’ into the air.
Given the nature of the coating on these bags you have to expect more distasteful leaching than you might experience with hard plastics.