GE Nautilus problem with cleaning
 

I have a GE Nautilus dishwasher that recently has started to leave a lot of particles on the dishes particularly on the upper rack. I also noticed that the water doesn't seem to drain completely as there is a small amount on the bottom after a wash. I think the drain may be clogged but I'm not sure. I do rinse off the dishes before loading so there shouldn't much of anything there if at all.