Cleaning breastpump pieces


Does anybody know if breastpump pieces need to be cleaned BEFORE every use? I put everything from my breastpump in the dishwasher and then through the sterilizer, let them air dry over night on a clean separate towel and then stored them in ziploc bags but I want to pump tonight so I can give a couple bottles when I leave little one for a few hours! I just don’t know if I need to clean them again since they’ve been in the ziploc bags