#1. "RE: Now it's College Pro painters." In response to Reply # 0
Removing the signs is now the right strategy. You gave them two chances to show they have moral fiber. They don't. You first tried to reason with them, giving them a chance to prove they had a whit of consideration for others.
Now it's time to hit them in the wallet.
"It's 10 p.m. Do you know what Dumpster your street spam is sleeping in?"