white gel pens
I had the same difficulties with white gel pens. Bought several at different craft stores and still went back to the SU Signo gel pen. If it is dry soak it in very hot water nib down. You may even need to tap it on the bottom of the glass you are soaking it in. This works if the whole pen is not dried out. I have had the best luck storing it vertically with the nib down also.
Hope this helps!