Okay guys need some help. I'm seeding the second week of September. Currently nuking the lawn. I have a few good sized spots in my lawn that nothing has ever grown but crabgrass there. I did the screwdriver test and it only goes down about 3 inches after a decent rain. Should I just use baby shampoo on the area for the next four weeks and triple aerate it before seeding? Or should I till this area up down to six inches a week before seeding? I didn't get to Harley rake this area 2 years ago when I built my house. I ran out of time for the rental..