How do you remove Silcoseal bondbreaker residue from exterior wall panels prior to painting?

Nox-Crete recommends that all exterior tilt-up wall panels be properly cleaned prior to painting. To clean wall panels, mix a solution of trisodium phosphate (TSP) detergent and water by dissolving 0.5 lbs. of TSP in 1.0 gallons of water. The mixture should then be sprayed on the wall panel and allowed to stand for 15-20 minutes. After this time, rinse the TSP residue off the wall panel surfaces using a minimum 2000 psi pressure washer equipped with an oscillating spray nozzle.