Does the type of detergent make a difference on crayon quilts or the settings for the wash/dryer?

I have several potholders that my grands drew with crayons their hand prints. They are years old, been washed many times and the hand prints are still there. I do know it has to be Crayola Crayons as they have the most wax and better color pigments and heat set for the color to stay in. The cheaper crayons will not hold up. I learned that with other potholders.

if you do want to fold it, they have acid free tissue paper for storing quilts. you can put that in between folds.