Outboard cooling systems descaling and desalting

This is a common problem with operators who do not have easy access to regular rinsing facilities and like me, because the motors are regularly used for approximately two hours daily, accumulation in the systems is unavoidable.

Downtime on the dismantling for eventual physical buildup evacuation is always a problem which promted the quest for perhaps a chemical solution.

As the motor block and water passages are of alloys that succumb too readilly to normal acid based descalers, I am at a complete loss! Fellow sufferers, speak with me please!!