Thanks for your reply. I always wipe down my piece before glazing, but these pieces are really dirty. I'll try the wash method and let them dry in the sun:)
I have many pots that I created using cone 5/6 white stoneware years ago, but never glazed them. Many of them have collected dust and "yuck", and I am inclined to refire them to cone 04 hoping the dust will burn off. I am about to fire a 04 bisque load and want to add them to my firing. Any suggestions will be appreciated! Thanks