 [ Symptoms ] what is the cause of verdigo for a type 1 diabetic [ Disease ] pvc like silicone is non porous so if you clean it properly it will be safe it is worthwhile to go to a smoke shop or craft store and pick up a pack of pipe cleaners they are perfect for going in that little hole and catching anything you need to then fill the syringe with some rubbing alcohol and pass it through a few times clean the outside with more rubbing alcohol let it dry and you are good to go