Winterization Air vs Chemicals...... Your 2 cents please

I used AF for 3 years and the last two have used air with AF only in the traps.
Take your time and don't forget anything, including the outdoor shower.

I pump 60 psi through my lines without issue. Open one faucet at a time until it blows sputter free for 20-30 seconds. Move to the next. When done, I drain the low point drains and hot water heater and then I pour about 2 cups of AF down each sink, the shower and in the toilet. Come Spring, I sanitize and go.