I dipped them with vinegar/water for 3 weeks, washed with pressure washer, bath in summer sun for 1 week, soaked them in rodi water for another 2 weeks! Only thing i didnt do was the muratic acid! They were old rocks 2-3 years old so they should leach out all the po4! If you bought dry rock from online then i would recd acid bath!
If you wanna cure those rock, i'd recd put in a tub with salt water, circulation and a heater. Find a "pest free" live rock, throw it in there and wait a few weeks! You can run some gfo if you want!