What to do with Cascade rinse agent?

I just found this post: http://cuttingcouponsinkc.blogspot.com/2009/06/homemade-automatic-shower-cleaner.html#comment-form

It explains what you can do with the Cascade Rinse Agent that we get for free with the coupon from Home Made Simple.

Here's the link for the coupon booklet, it's pretty cool because you get alot of great P&G coupons in it.
http://www.startsampling.com/sm/100900/quickQuestion.iphtml?item=100900&source=

I'm basically going to use this recipe to make cleaner to clean my shower because I don't have the Scrubbing bubbles automatic shower cleaner thing.