Excel is the latest state of the art cleaner to be used in carpet extractors.   It is a strong but safe formulation that has all the features needed for carpet extracting:

1) a high solids, highly concentrated product- you only need a small amount, 30:1 solution

 2) cleans the worst stains, grease, and dirt without leaving any film behind, just a clean carpet

3) a low sudsing formula

4) a safe, non-toxic formula, even safe around food.  You can't do any better than Excel-  your extractor will run better and need less maintenance, because Excel's 100% non-caustic formula will not create any sediment that sits in the machine!