Never heard of Boat Juice.
But I will share what has worked great for me.
Mothers CMX Ceramic Spray Coating. Very easy to apply to boat. Makes cleaning the bottom a breeze.
We boat in the Ohio river. We have a ring showing after being in the water a few hours. We usually stay in the water 3 days. When trailering the boat we park and wipe down the boat with a wet towel before leaving the parking lot. This cleans all the crap off the boat. Completely clean. No soap of any kind needed. Ceramic lasts so much longer than was ever did.
We have applied the ceramic twice so far this year. Might do it one more time time before labor day.
Available on Amazon.