+1When we made jelly years ago we used a cotton pillow case.
My Grandmother always scolded us if we pressed on the bag until after the first clear juice dripped through on its own, that was for the clear jelly to impress the other ladies in town and to use as gifts. Next we switched to another bowl and squeezed out every last drop of juice, that made cloudy jelly for us to eat at home.
So I'm with CWS4322, cotton pillow case with no fabric softener or dryer sheets used when you wash it!