Target has Windex products as part of a promotion: buy four and receive a $5.00 Target gift card. There is also a Catalina promotion on Windex products:
Buy 2, Receive $1.00 Catalina
Buy 3 or more, Receive $2.00 Catalina
Stack a newspaper coupon from the 7/26 Smart Source insert with a Cartwheel offer to pick up four packs of Windex wipes for $9.36 out of pocket. Then receive the $5.00 Target gift card and the $2.00 Catalina, making the final price only $0.59 each!