I got 2 official responses today from authorities and I thought I pass them along. First I had a phone conversation with the service manager at my RV dealer who I bought the washer dryer from. They install quite a few Spendide W/D; I've seen them on pallets in their warehouse. He said they always blow out the complete water system including the washing machine regardless of brand. after a few minutes of not hearing water coming into the machine they cancel and drain the washer. That's what I did with the Whirlpool and they said to continue to do the same with Slendide. Next when you pour pink stuff in the sinks dump a quart in the washer drum and do the spin and drain cycle.
Secondly, I got a reply email from Slendide tech support and they said, "I prefer the Optional Winterization Instructions using cycle 3 even with compressed air". The instructions he was referring to are below:
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Jim & Martha Abernathy
2014 Montana 3402RL Level UP, Sailun S637's, TST 507, 500W solar
2014 Ram 3500 Laramie® 4x2 diesel dually crew-cab 3.73 axle, Reese R20