I assume you mean ACC (Anti Corrosion Concentrate). My keyboard does the same thing. 
Tormek recommends it (primarily) for diamond wheels and also for any of the other Tormek wheels. Are you using it at the recommended dilution, one part concentrate to twenty five parts water? I suspect the exact ratio is not critical; however, I have always followed Tormek's recommendation.
I always rinse and dry my trough when I empty it.
I have never used the Trend lapping fluid, so I can't offer an opinion on it, pro or con. ACC offers corrosion, needed for the steel wheels. If left to aur dry, it also leaves corrosion protection for tools.
Ken

Tormek recommends it (primarily) for diamond wheels and also for any of the other Tormek wheels. Are you using it at the recommended dilution, one part concentrate to twenty five parts water? I suspect the exact ratio is not critical; however, I have always followed Tormek's recommendation.
I always rinse and dry my trough when I empty it.
I have never used the Trend lapping fluid, so I can't offer an opinion on it, pro or con. ACC offers corrosion, needed for the steel wheels. If left to aur dry, it also leaves corrosion protection for tools.
Ken