Drive through car wash with undercarriage spray once a week in winter. But honestly, if you have OCD and are going to get anxiety from a little surface rust on underbody parts after a few years, you should probably it another car. I have been driving in New England winters for 30 years and no matter what you do, you will get some rust. You can take precautions that will reduce it, but you can’t prevent it. Does not bother me because I buy nice cars to drive — it would bother me more to be driving a beater when I had another car that could do the job.
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