I have given up trying to remove this shadow chemically. You can see it in the left hand bottle.
Nothing seems to shift it without brushing..... So can anyone recommend a decent bottle brush. Perhaps even one that fits a drill?
Bottle brush recommendations
Re: Bottle brush recommendations
https://www.themaltmiller.co.uk/product ... ttachment/
This works well if you haven’t found a solution by now
This works well if you haven’t found a solution by now