
What is this hard residue on the blades and how do I remove it?
I make a smoothie every morning and, on every blender I've had, this solid residue builds up and it seems impossible to remove.
The smoothies consist of bananas, frozen berries, spinach, whey protein powder, and milk.
I admit that I don't scrub the blades after every use – I just rinse with water and let it air dry. I live in the Seattle area, so we don't have hard water.
I would love to know what this is, how to remove it, and how to keep it from happening again.
Edit: It isn't some kind of coating chipping off. The buildup got pretty thick on my previous blender (Magic Bullet), prompting me to get a new one(Ninja). I've tried soaking in Dawn and scrubbing.