I tip the guys who valet each time (forklift operator and at the gas dock as well)
They remember and get to know you and I feel when they see your name on the board they will do their best to accommodate you.
I am generally, generous with all service oriented people that give good service in the way of tipping. I put myself in their shoes and if I were busting my hump to serve and got no acknowledgement, I would certainly remember who that person was.
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