That's why I prefer the microwave method. With the crock pot, I tended to walk away and leave it, and by the time I got back, dried soap had accumulated on the sides and there was no way to get it to melt back in. With the microwave, After the initial 2-3 minutes on half power, I stir it down, then cover and zap in 15-20 second intervals, stirring down in between until it's all melted and at the right consistency. So the key is to stay right on top of it while it's doing it's 'thing' in the MW and the scraping and stirring down in between zaps.