Homebrew PCBs

>Yes, but it will only etch so much copper than then no more

The disposal of spent Ferric Chloride has generated several posts in 
newsgroups. From the mixing with washing soda first to the mixing with 
cement before disposal in the garbage. Out of curiousity, how many of 
us here just flush it down the toilet (and clean the bowl afterwards) 
or pour it down the drain with lots of water? I have about two gallons 
of it in the garage along with about 20 gallons of used engine oil and 
transmission fluid. Waiting for the getup and go to cart them all to 
the recycling center.