hey- I'm cleaning and sterilizing (or re-sterilizing in some cases) my equipment before I open my studio tomorrow. Noticed some of the tubes that have been sitting (I've been using disposables while I waited to get an autoclave) have some rust. How finicky do I need to be with this? Throw them out? Rub it all out with steel wool? Don't worry too much because it's not the part that comes close to skin?