well sir i prefer to use glass flasks with rubber stoppers and foil over it with the medium placed in the pressure cooker..allow to cool for some days and then use...by that time u will see any fungi or bacterial growth..with the baby food jars spores can enter from below the rim somehow...muchhh less so with the little holes in the stoppers which btw are covered with a round waterproof band aid made by 3M.....u will get plenty contamination if u use those baby jars....now also the bleach is in a ratio of 1 : 5 or 20% solution.....i dont know about ur ordered seeds as i have only used seed capsules harvested from the plants and i clean them with a toothbrush and pure bleach.....sorry i cant help u there