Cracking job - didn't think anyone used the old sponge these days with lambswool wash mitts etc Suspect it's not too much of an issue with the two bucket approach. The tool you use for the zorsts - what kind of tip is it, is it quite hard and do you put any product on the end (some metal polish etc)?
Zymol sponges aren't your average sponge

I used a Dremmel type of tool with a polishing stone for the inners. Megs NXT metal polish then finished with 00 gauge wire wool and NXT