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I'm trying the air method this year as it took so long to remove the taste and smell of the RV antifreeze this past season. I used 40 psi at the city connection and opened and closed faucets individually until there was nothing but the sound of air coming out(toilet, black flush and outside shower/faucet as well). I also cycled the pump while the air was flowing. RV antifreeze in the P-traps. My only concern is the possibility of a very low hanging line collecting what is left like Jeff mentioned. PEX is very forgiving and so the scale tipped toward this method for me this year.
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