You can dilute it if you want, it'll not be as effective. Stainless is pretty resistant to stains.
I'd wipe it clean with whatever solution on rag, wipe again with water on rag, and then dry. Unless you REALLY like the smell of vinegar.
I'd wipe it clean with whatever solution on rag, wipe again with water on rag, and then dry. Unless you REALLY like the smell of vinegar.