I'd just give em a good wash with some hot water and a oxyclean or bleach mix. Then let them air dry. Should do the trick. You can always keep your grains in turkey bags as well, those things work great to keep fish and stuff from stinking up the place so I imagine it works the other way around as well.
EAC - 5/2/14
Growing Hops in Key West, FL....
: Apple Pie Cider
: Imperial Ginger Cream Ale
: Chocolate Witibier
: Mango Cream Ale, Muddy Waters Stout, Muddy Waters Bourbon Chocolate Stout, Wheat APA,
: Black Caesar RIS
: The HBT Sweaty Fat Guys Cigar club