I worked on scrubbing out the last remaining burnt sugar from my 5 gallon kettle. Baking soda paste was very helpful, followed by a hot PBW soak, then light abrasive still left a thin layer of carbon. Starsan soak took care of that, and perhaps if I had thrown that in after the PBW the light abrasive could have been skipped. Anyway, it’s now sparkling clean and ready for a brew day!