I dislike the smell and taste of the pink stuff so have been using air for better than 20 years. I use the same method as the previous poster, but also use air to blow the traps out. I use my shop vac to blow my traps and leave the tank drain valves open all winter. I have quick connects on my 12V water pump and disconnect the discharge side, put a towel under it and run the pump for about a minute to get any residual water out of the pump. It doesn't hurt the pump to run dry for a short period of time. I rehook everything up so it's good to go in the spring. Haven't bought pink stuff in many many years.
PS:
Remember to do your black tank flush and outside shower if you have one. I leave all faucets cracked open all winter and leave my low point drains open.