After the dishwasher runs there is a lot of soap left in the soap dispenser. I've tried powder and liquid. Liquid is a bit better. I've tried using less soap but there still is a lot left. Also my glasses seem scratched. Thanks!

With the LG LDF6810 model, this is not a common problem. Please try the following test, With and empty dishwasher, add a small to normal amount of dry dishwasher powder and run an (empty) load.
Check to see if any soap remains in the dispenser cup.
If any remains, here are three things to do: 1.) Upgrade your dishwasher detergent to a name brand powder (e.g.: Electrosol or Cascade)
2.) When you load the dishwasher, do not place large items in the front, near the door/soap dispenser.
3.) Before you load the dirty dishes for the next several loads, with your hand, turn both the upper and lower wash arms so they point at the door. Load as you normally do and push the racks fully in. Before you close the door, spin both the upper and lower arms and confirm that they spin freely and neither hits anything. if either does not spin freely, pull out the rack and arrange so the arms can spin freely.
I find that the only time I have left over detergent powder is when the wash arms do not spin freely.
This is a common problem on most every energy star/water conserving dishwashers.
Please report back what you find, OK?