There is a new $1/1 Windex coupon available HERE.
There is an upcoming ECB deal at CVS next week.
Here's how to get 4 bottle for $1
Buy 4 WIndex at $2.50 each ($10)
Use 4 $1/1 coupons (you will need 2 computers)
Final Price= $6 - you will get $5 ECB back
That makes it $0.25 per bottle
You can also submit this for the $5 SC Johnson Rebate HERE