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You want to use a dry spray lubricant. They leave nothing behind to attract dirt. There are many brands out there and can be found at any auto store or big box stores like Home Depot. WD40 even makes one. I have used one to lubricate the garage door so you don't get any drips.
Just like Vetteman said, use white lithium grease. Only use a small amount as it builds up over time. Apply this with this type of brush as you will have more control over where it goes and how much you apply.
