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!

Buy 4, Receive $5.00 Target Gift Card through 9/5
Buy 3, Receive $2.00 Catalina through 9/6

Use four $0.50/1Windex Aerosol Glass Cleaner (coupons.com)

And use 5% Off – Windex, Target Cartwheel Offer (exp 9/26) – (cartwheel.target.com)

Pay $11.26, Receive $5.00 Target Gift Card and $2.00 Catalina

Final Price: $1.07 each, when you buy 4