I just ordered the sodium percarbonate and the sodium triphosphate. 2 kg and 1 kg. I will give it a try and if this also results in residue, then I will try adding detergent or EDTA.I use Oxi Scent-Free frequently for pre-soak stubborn gunk, and add a healthy squeeze of 7th Generation (plant based) detergent, either liquid or dry granules, which is a strong surfactant that lifts and suspends the solids for a simple cleaning rinse. I then follow up with a small amount of PBW, if necessary, and then sanitize with Star San.
Oxi + TSP works well for getting rid of the gunk, but adding a surfactant detergent reduces residue from the percarbonates.
I am a bit "afraid" of detergent as it is, like soap, a terrible head killer. I actually do not want stuff like that in my cleaning solution. That was basically the main reason I switched to these Oxiclean based cleaners.
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