I tried removing the yellow stain from a white T-shirt that had been sitting in a drawer for two years.
I diluted the CLIMA 10 times and the yellowing was severe so I soaked it for 2 hours and then washed it.
I didn't rub it, but most of the yellowing was removed and it was no longer noticeable.
There was a little bit of yellowing left on the neck, but it's gone down to a level where you can't see it unless you look closely.
The tag and logo will not fade even after being soaked for 2 hours.