I've been staying at my parents' and have pumped a couple of times and stored the milk in medela screw top bottles in the fridge. My mum has just thrown out a bowl of blueberries she had forgotten about that had tin foil over the top and were right next to the bottles of breastmilk...they were pretty furry. Would you still use the breastmilk bottles (two pretty large ones)...or throw them away and deep clean the fridge before storing breastmilk in there again?