in flush when noah and abbey visit shelley what do the ask her to do

Noah and Abbey went to see Shelly, reminding her that she offered to help them. She was afraid that if they killed Lice, they might kill her and the two kids. But Noah and Abbey were adamant. They were determined to put Dusty out of business and they needed her. They explained their plans and that all she had to do was flush and flush and flush again.