Um, one step is not NORMALLY used as a cleaner in brewing, it is used as a sanitizer and it is a pretty poor one anyway.
But to clean your gear a lot of folks use a brewery product called PBW (Proffessional brewer's wash) but many more of us these days use unscented oxyclean or one of the generic versions of it. No scrubbing required, let the bubble do the work. And rinse thoroughly.
SInce you are already using starsan to sanitize then I guess you can for now use the onestep to clean (since technically it is closer to a cleanser that an fda approved sanitizer like starsan and iodophor.) so you might as well use it up, but after words go to oxyclean, you will get better results.
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