oven to table stoneware

i have a few oven to table stoneware serving pieces that ill put food and warm in the oven and serve on them. do these need to be koshered? and how>? then i also have a few oven to table pyrexes that are white and glazed. do these need koshering?...

gray poupon

distilled white vinegar, mustard seed, water, salt, white wine, citric acid, tartaric acid, fruit pectin, sugar, spcies (i know you put distilled white vin as an ingredient on the list but i still get nervous especially bec its the first ingredient)...