Digital BW, The Print

My Epson 3000 is acting funny. First, the tops of large prints 
banded. Then,after several head cleanings, the lower left hand block 
of lines is still uneven, and there are odd spots of ink on the page. 
How do I get to the heads to do the Windex cure? The User's Guide is 
useless. I need to print now. Please help.
                Arlene