Homebrew PCBs

Hello Group,

I use Tinnit to tin plate my boards after etching.  Tinnit is an
electroless tin-plating solution.  The packaging indicates that it
contains acidic tin salts and no cyanide or other highly poisonous
materials.  I've tried to contact the producer
(http://www.philmore-datak.com/) for information regarding disposal
but I was unsuccessful.  Any disposal tips for Tinnit would be greatly
appreciated.

I also have some MG Liquid Tin to get rid of (spent and a few brand
new bottles).  Tips for disposing of the spent Liquid Tin and/or
takers of the new bottles would also be appreciated.

Finally, I've learned that my area does not have the special haz-mat
pick up day that I've heard about on this group.  I've located my
local haz-mat facility but have not yet interacted with them.  Any
ideas of what to expect?  Will it be expensive?  Will I pay per volume
or per weight? Will they want to know exactly what is inside each of
my carefully sealed and "yuck" labeled containers?

Thanks.

Ed