Update: There's a landscaper next door digging out the mud behind the wall. Neighbor came over and asked me to show him what needed to be dug out. Got DH, and walked over to show him where the mud had killed the grass and the shrubs. I think the landscaper realized he should have brought a crew. We'll see how it goes.
Luckily, I had photos on the iPad to show the guy what it looked like before and after the mud.
