Digital BW, The Print

I want to clean out the ink system on my 7600 and I'm
having trouble finding where MIS sells bulk cleaning
solution on their website (assuming they even do).  

I don't want to buy cartridges of the stuff because I
want to use it to flush out my existing refillable
cartridges as well as the lines and printhead.

Has anyone seen where they sell the solution in
bottles?

Thanks in advance,

Ken