De-trickulatatin a header coating conundrum.

Is it worth it to thin down some ospho with distilled water and blast the ship out of them with that after sandblasting? Could that help etch the metal and remove traces of sand by way of magical chemistry and velocity?

I could blast the ospho mix on there by way of a small pot sand blaster full of the solution, running at 120 psi.


I dont have any other type of prep / etch chemicals around that I can think of.