Well I have heard good things about it, But have never used it.
IMO you have to be careful with all the add ins, don't use more then you have to. And somethings just don't work.
Like this will take all the crap out?? Were does it go?? what does a little germlin carry it out in the night when you sleep??
It takes the water out of your tank?? How is there a grelim and his budys sucking straws all night from your tank??
Don't get me wrong there are a lot of good things out there!! But it all has to run thur the motor and carbs and lines before its gone!!
So becareful of snake oils!! Sometimes its just good old hard work needed to get it done and a little hard worked never killed anyone!
I use gas, oil, foging oil, decarb addative and thats it! When my old tanks needed cleaning, I emptyed all I could then removed the tanks cleaned dryed reinstalled and started new!
This was what was in my tank that the old owner left me, and nothing would have gotten it out!!