I have a ceramic grill that I have only ever cooked organic chicken breast and organic steak on. I have occasionally added spice but not for months as it makes too much mess. After cooking, I drizzle warm water mixed with washing up liquid on it from a soft cloth, whilst the grill is still hot (generating a lot of steam), then wipe it in order to clean it efficiently.
After I have cleaned the grill and it starts to cool, I have noticed white powder on it, as shown below.
I can scratch this off gently with my thumbnail and it comes off cleanly, as shown by the highlighted area below:
This leaves a black substance under my nail that has a slight meaty smell:
Can anyone suggest what this is? My first thought was salt, but I don't add any to the meat (or is there enough in it to cause this?). Or could it be something to do with the washing up liquid I use to clean it?
(This is my first question here, be nice. And yes, I know I could write to the manufacturer, but trust impartial individuals on here just as much :))