Washable potty pads is the way to go. Then you can thoroughly clean them every day. You are right about the grid things, tried that, what a mess to clean. So much easier to just throw a pad in the washer (after flushing the solid stuff of course). The ones I sell are very absorbent and the pee soaks in right away. I have a whole box of rejected fabrics that are so cute, but didn't make the cut because they took too long. Anyway if you are interested here's a link to my current sale thread.
http://www.yorkietalk.com/forums/sho...d.php?t=107168
I got tired of the pee from the edges soaking underneath, leaking, the puppies tearing the paper up, etc. The washable ones are so much better. I definitely recommend them regardless of where you decide to get them.