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In the old days before individually wrapped servings of everything, many foodstuffs were shipped in barrels, and sold from the barrel. Pickles, for example; the merchant would open the top of the barrel, and customers would reach into the barrel with tongs and take the pickle they wanted. Since the customers could easily see the pickles, they would normally pick a good-looking pickle, leaving the less desirable ones behind. So, the pickles at the "bottom of the barrel" were the ones that nobody else wanted. In trying to pick up one of these least-desirable pickles, the customer would "scrape the bottom of the barrel". So, to "scrape the bottom of the barrel" is to have selected one of the least-liked options.
Abrade means to scrape or wear away via erosion or friction.
Clean via power spray, scrape and sand, prime and paint.
Possibly scrape it off with a scraper if it is thick enough to do so.