Freezer paper has a plastic coated side - not waxed. Don't iron that side. I also use a fabric softener sheet with or without salt to clean my iron. But make sure it's on an old towel or something because it makes an oily spot. My thoughts on non-stick irons is that anything abrasive like salt would not be good. For a non-stick iron surface I would use Faultless Iron Cleaner that comes in a little one time use tube with twist off tab.