In case anyone is interested in cooling flushing.

Thanks for the video. Twice a year is thorough, but another guy has you beat, saying he used to swap engines between winter and summer.

I'm low-maintenance focused so use Evans Waterless Coolant in most my cars (and silicone brake fluid, silicone hoses, Viton O-rings, ...). I did install a stainless screen in the top radiator hose to catch debris before it can clog the radiator tubes, but never found much. Before installing Evans, I flushed by driving with water w/ citric acid for a week, then flush with water several times, then dry in our hot summers by running air thru w/ a sleep-apnea puffer for a few days. Getting all water from the heater core is hardest. I used 60 psia air, blocking and venting it to puff the water out as droplets.