(Question submitted by Don)
Salt water is naturally corrosive so to put it simply prevention is the best cure. Unfortunately, once you have a salt buildup in around the heads and side plates, there is really no option other than to book it in for a service so that your technician can take the engine apart and clean the water galleries for the cooling system.
There are products on the market that help clean the water galleries in the engine (like Salt Away), but you really need to use these from day one when flushing your motors.
Those products are really designed to help prevent salt build ups, not break them down once they've accrued.
This is why properly flushing your motors is so important.
You can check out our guide on flushing motors: https://www.edencraftmarine.com.au/post/how-to-flush-your-outboard-motors-properly-in-5-easy-steps
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