Downey fabric softner works fine too. Just the cheapest stuff you can find. 1-2 cups will keep the side walls slick and tank empties well. Look on YouTube and I think there is a video. I would think any low sudsing detergent would work fine. I prefer liquid, but powder mixed with water would be good. I like the Pine Sol idea too. Mr. Clean has a more pleasant odor to me, that would probably work too. Lot's of cheap solutions out there. Best regards, Doug
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