Disolved the salt and poured the mixture over the t-shirt.
Sealed up the container and patiently waited 5 days.
Ummmm epic FAIL!!
The t-shirt is not soft. This t-shirt actually feels ROUGHER than before I started!!
Basically, I wasted a cup of salt and a t-shirt.
I'm going to try this one again with a 100% cotton t-shirt.
(The 'fail' T-shirt was a 50/50 polyester/cotton) I will use this same recipe and I'll let you know.