Hot tub gunk?

i hesitate to call it scum because it isn't typical deposit. It is yellow/beige and gluelike in consistency. the chemical upkeep has been regular, and no one has used it in several months.The deposit is at the waterline and my elbow grease is gone from scrubbing with nonscratch pad. I also notice a light... show more i hesitate to call it scum because it isn't typical deposit. It is yellow/beige and gluelike in consistency. the chemical upkeep has been regular, and no one has used it in several months.The deposit is at the waterline and my elbow grease is gone from scrubbing with nonscratch pad. I also notice a light powdery type coating on all underwater surfaces. Anyone know what it is and how to keep it gone? My tub has an auto clean cycle. thanks
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