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 printable manufacturer coupon with a Cartwheel offer to pick up four bottles of Windex aerosol cleaner for $11.26 out of pocket. Then receive the $5.00 Target gift card and the $2.00 Catalina, making the final price only $1.07 each!