[flbrewer]

Does this matter in the scheme of things? Tried scrubbing with a rougher sponge but nothing. Caused by burnt LME.
http://instagram.com/p/ZtLsmtR3Y0/

[morticaixavier]

not even a tiny bit

[Joe Sr.]

That's called character.  It makes your kettle unique.

[aschecte]

No it really makes no difference but, if it makes you feel better make a semi strong solution of PBW and water ( assuming this is not a aluminum pot). Soak your kettle for a day or two and then take a scrubby pad like a scotch brite pad and scrub it should come off. I had something similar happen to my thermometer heat shield when I had a boil over and the method I described above took 95% of it all off.

[flbrewer]

It's stainless FWIW

[HoosierBrew]

That's called character.  It makes your kettle unique.

+1. 

[joe_feist]

Can't imagine it matters. I rarely brew using the outside of the kettle anyway .

If PBW doesn't do it, I'd suggest Barkeepers Friend. I use it on my kettle and it takes everything off.

[oscarvan]

When brewing 10 gallons finished in a 15 gallon keggle it's not a matter of if but when you have the mother of all boil overs. Doing this repeatedly leads to serious carbon deposits on the outside. Once in a while I take a while wheel to it. For the rest, indeed it's character, or rather, patina.