I use brake clean -- but I use
NON-CHLORINATED
#1 rule in TIG -- CLEAN CLEAN CLEAN CLEAN
This ain't MIG (farmer) welding... TIG is all about tight fit ups - bare - cleaned metal - NO oily residue. This is precision welding.
ASSume you're using Argon gas...
The DIAMETER of your tungsten sets the limits of your heat. So check the amperage ratings of the diameter and type of tungsten you're using.
There's a thread here about tungsten sharpening. There's also a TON of info and videos on Miller and YouTube etc.