I've never had any luck with the carb cleaning magic juices - not tried that one though.
Citric acid works a treat on tanks and is cheap - doesn't need much more than overnight.
I can't find the name of it, but there's one that WeMoto keep on the counter and I've used it a couple of times. I feel like it's helped in the past but I imagine its just as effective as feeling faster in new bibs and jersey
I've never had any luck with the carb cleaning magic juices - not tried that one though.
Citric acid works a treat on tanks and is cheap - doesn't need much more than overnight.