Whitewash on the forehead hardens the brain into a state of obstinacy perhaps.
Anyhow, with whitewash from the wall on my forehead, my obstinacy was adamantine.
Then, we went into the hut, where there was a smell of tobacco and whitewash, and a bright fire, and a lamp, and a stand of muskets, and a drum, and a low wooden bedstead, like an overgrown mangle without the machinery, capable of holding about a dozen soldiers all at once.
LOT 1 was marked in whitewashed knock-knee letters on the brew house; LOT 2 on that part of the main building which had been so long shut up.
There are no more uses of "whitewash" in the book.
Show samples from other sources
One could whitewash all he pleased, and put up comic neon signs, but the aged timbers stood strong under their additional burden.
Harper Lee -- Go Set a Watchman
For ten bucks, you could graffiti your name on Tom Sawyer’s whitewashed fence, but there were few takers.