I have a Maytag Dishwasher, Model #MDBTT79AWW, for which there is no Owners Manuel. I called the Company and even they couldn"t find one for me. I realize that the screen needs to be cleaned on the bottom of the dishwasher hense the standing water. However I can"t find any directions to look at to do this.. The screws on the bottom are like ones I have never seen. I can't afford to call an Appliance place for them to come and fix this so if any could advise how to take out the screen and clean it to fix the standing water, I would appreciate it.