Not all Black Friday products can be as exciting as a big-screen television or an X-Box, but savings are savings. Among the offerings on cleaning supplies in Walgreen’s Black Friday ad: a “Buy 1 get Two free” deal on Arm & Hammer laundry detergent, 11 ounces of Gain dishwashing liquid for 99 cents, and a single roll of Tuf brand paper towels for 49 cents.