Lead free designated soldering irons

Hello everyone. I have a question pertaining to solder irons, tips and solder stations. We recently have set up our lead free wave and reflow oven. We still have quite a few projects that require leaded solder. I was curious how others handle rework solder irons, and tips. We have adopted a rule to use only designated lead free irons to solder lead free and if a leaded board needs rework you have to change a tip or use a lead designated iron. All tips that I have seen, are lead free. I realize it is important to use the correct solder, but as long as the tip is kept clean either by regular or wire sponges, the amount of contamination should be very little if any. What are your thoughts?

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