I have the same one and I still get the white marks , I mainly use mine as a hot water tank with the solution and a toothbrush now
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I’ve never had a commercial one as I don’t make in large amounts.
I still use hot water washing up liquid and a toothbrush as we did when I trained. Have never had any problems with marks doing it by hand so if time is a factor and you’re having to repolish and then reclean that seems counter productive. The only time I found a cheap one useful was for getting the compounds out of chains. Mine died more than a year ago and I’ve never replaced it