I'm trying to understand my beer's inability to have head... It pours great with a good head... and about 10 seconds later... zilch. No head, no lacing... nothing. Any chance some PBW cleaner residue might cause this? It's a Wheat DME beer with C60, lightly hopped. I would think there's plenty of protein for good head! It's either that, or something went wrong during fermentation... the beer "tastes" ok, it's not spectacular, but it's drinkable. Any ideas?? Thanks!