Since my July 5 post I've added a White Lightning chain cleaning tool. Kicking myself for not getting something like it sooner. Much more efficient than all the makeshift stuff I've tried before. Pretty much any of the $10-$20 chain cleaning tools will probably be more efficient than two toothbrushes taped together or all the other tricks I've tried.
The only improvement might be a chain cleaning tool with side brushes. The White Lightning tool has long, stiff bristles that dig down between the links and rollers. But the outside of the chain doesn't quite get as cosmetically clean looking without a little extra work. No big deal. I'm less likely to neglect the chain after gravel rides because this doodad makes it so easy.
So, yeah, occasionally some folks are persuaded by these endless debates. I was.