I've never tasted drainage cleaner, so I wouldn't know. Drain cleaner, however, is a different matter: entirely unsuitable for seafood. Fowl, yes. But never seafood.
But just two questions CP:
1) How do you possibly know what drainage cleaner tastes like? That's a whole other thread, and I will be waiting to pounce in on that one.
2) If it's tasteless, how can it taste like anything, let alone drainage cleaner?
At the end of the day, I know what you're saying. The no name mayo just doesn't make your buds dance. I can appreciate that.