Chrome removal from Bumper

Tried blasting with 80 grit aluminum oxide and 60 psi and not much success. Tried recycled glass at 100 psi with better results and too slow. $50.00 of hydrochloric acid from HD and let it sit for a week and most of it was gone. 4 - 5 lbs boxes of baking soda and the job was done. Considering all the electric for the compressor and grit, acid is the better. That's what a bumper shop would do.