As the manual says, for 'internal grease and dirt'. As in following oil contamination or a neglected system.
Laundry detergent would do little for calcium deposits. But along the same lines, any acidic flush strong enough to dissolve the calcium could reveal some leaks. A truly calcium clogged radiator will need to be rodded or recored.
I've always just used plain water, the drain plugs open, overflowing while it runs with a heater hose removed or the thermostat removed. That will get the free floating rust out, but usually by that point there is an abundant supply in the lower regions of the block.
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Today's Featured Article - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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