Been using 91% ISO to soak my atties for three years now, it works just fine.
Some tricks;
If you let the alcohol dry, it will leave a film. Add PG or e-liquid while still wet, and it becomes a solution which can be blown out of the atty.
Never store atties dry, a drop of PG, or e-liquid will prevent the coil from oxidizing.
Letting atties dry overnight shortens the life of the atty.
Using either hot water or alcohol to clean atties means that e-liquid is water and alcohol soluble ... right?!?
Well, guess what! That also means that both water and alcohol are e-liquid soluble. So use e-liquid to get the water or alcohol out of the atty!