Quick Question Flushing And Cleaning Radiator

[RunningRed]

Hey fellas I had a quick question about using the washing soda and distilled water for cleaning out the radiator and block. I drained the antifreeze out and flushed both the upper water jacket and drain hole with distilled water. I mixed up the cleaning solution and ran the tractor around the yard for over an hour. The solution from the radiator cap looks pretty clear, I think I flushed most everything else out of the motor and radiator already. However it's late and I don't have time tonight to drain the solution out and flush the motor again prior to adding antifreeze. Would it hurt sitting overnight till I can get back to it tomorrow? Would it cause any internal flash rusting sitting overnight?

 

[RustyWrench]

Overnight is totally fine. Washing soda is alkaline so it actually protects against flash rust while it's sitting.
Flash rust is more of an issue after you do the final clean water rinse, that's when bare metal can flash up if you let it sit wet too long. So tomorrow just drain, do a couple distilled water flushes, and get the antifreeze in soon after the last rinse. You're good, get some rest!