There are lots of brands of cooling system cleaners. You can get the Prestone brand at Walmart, etc. I'm sure auto parts stores have them too. Just follow the directions.
I have heard some say they use dishwasher soap.
Whatever you use, rinse well.
I use distilled if I remember to buy it. Otherwise I use tap water.
I have never had a problem that I know of using tap water.
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Jay Leonard
Ex boats: 1983 40 Albin trunk cabin, 1978 Mainship 34 Model 1
New Port Richey, Fl
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