Hot water is more effective at removing/reducing fat, I think everyone agrees with that. But then the question becomes "Does something get cleaner if you have two hot washes instead of one cold and then one hot?". Personally for me, it feels obvious that if someone doesn't deny "hot water will clean more than a cold water", then they also shouldn't deny "Two hot washes makes something cleaner than one cold and one hot", mainly because that's more hot water, and we already agreed hot water cleans better. The more clean hot water you can apply, the cleaner that thing becomes, I guess would be my conclusion.