The old 'Iodine' chestnut!
'No rinse' sanitizers don't seem to be approved in the UK so are expensive when you price them at online HBS.
I've looked and compared the contents of the 'Idophor' brand (Thanks ajf for giving me the ingredients off the back of your bottle!) to standard 'povidone iodine' solutions used in both veterinary and medical applications.
It's not the Iodine thats the problem - It's the contents of the 'solution' that's put me off. I've never found one in the UK that matches the list of ingredients which I know is 'at least US levels of safety'. Every one I've ever found is purely for 'external use', not ingesting.
I know - "Tiny quantities used, use a bottle tree, drip dry them, plus you'll also lose that goitre, etc, etc"
Maybe I'm paranoid, maybe I'm not. But really, I've already donated my liver to the greater good of this forum - I can't give up much more!