For satin stitching, I use a rayon thread. Not sure of the brand. I buy it from the Viking Sewing Machine center inside my local JAF.
Honestly, though, I don't much like the look of satin stitching so I do very little of it & just keep cleaning out my machine on a regular basis. I'm thinking the next time I try it I might use thread conditioner. I've only read about that, though, and am not sure how much it will help.
I'll be interested to see what others post. Perhaps there is a solution that I'm not aware of yet.