Actually, blipping a cold motor can cause MOMENTARY spikes of
oil pressure FAR exceeding the rated capacity of any of the coolers, which in turn can cause leaks. Aeroquip among others recommend use a check valve or a thermostat (which basically in this case serve the same purpose) with an
oil cooler. Such check systems are also integral in most power steering systems to avoid the same type of problem, but from prople holding the wheel at full crank and hence full pressure. Name or brand has very little to do with it. Certainly Earl's has a pretty good idea of what they suggest having dealt with AN hardware for over 40 years.
Now, to get back to the original point, an acid bath would not be required as long as you clean the spot of failure very well by itself. In reality, is $150 worth the hassle and/or the loss of peace of mind?