Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great product, but how do you clean it???

I love these. They heat evenly, the glass covers are perfect to cook with, the plastic I use for leftover storage and for transportation, they're pretty... well, they were pretty. Every use makes each white piece a little duller. How do you all clean these? The best luck I had was with a de-greasing dish liquid and a scrubbie, but it was an awful lot of work. Any suggestions???