Changing from green coolant to red?

[cbauto]

Yes I know not to mix them as it'll turn into sludge yada yada, but I recently got a new aluminum radiator and the car previously used green coolant and want to change to red or Honda blue because it's silicate free.

In terms of doing good full flush out of the old coolant, would doing the flush with distilled water and letting it cycle with the engine running until clear water comes out sufficient to clear out the coolant left behind in the block?

does the motor have a block drain bolt?

flush with tap water, cycle it.

drain from bolt.

just use tap water to flush unless you're made of money.

once you drain the block, will only be traces left.