[brokencookie]

Save the bag the cement comes in. Pour your leftovers into it at the end of the day. Then you can just put it in your trash. I have a concrete form I bought that makes walkways called a pathmaker. You can get them for under $20. I take my leftovers and pour them into one of the cells in the form and make pathway stones for the rest of the yard.
The final rinse of the tools etc I do into a small hole dug out back. With enough water, the sand and rock drop out and the small amount of cement is so dispersed that is never sets up. My hole is about 30 inches accross and 24 inches deep. I rinse all the tools into it and then let water trickle into it for about 20 minutes.

Bruce