dust on his windshield

I expect a remark about finding another woman. But he don't let on. Instead he gets up and grabs the poker and gives a log a quick turn on the fire. It blazes up so I look away. When it's too bright it's like the sun shining through a dusty windshield. Course Nelson don't let no dust stay on his windshield more'n five or ten minutes if he can help it. "Don't sound too good, Momma." He stands there warming his hands, palms out.

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Holier Than Thou