Whether you do it yourself or hire a fuel polishing company, cleaning the fuel/tank is two parts. One is a fuel treatment and the other pumping the fuel, many times, thru a Racor like filter that traps water and debris.
Treatment alone will not work unless you have an engine like Detroits that circulate much more fuel than they burn. Or add a fuel pump to circulate fuel thru your filter. For example, my Detroit mains pump 35 gallons/hr but burn 4 each. So 70 gallons/hr are filtered and 60+ gallons/hr returned to the tank.
I've used many fuel conditioners. The best is Archoil AR6200. I use it in my Ford truck and the injectors are at nearly double the expected life. It's also recommended by Jay Leno's garage. A side benefit is better mileage. In my Detroits I get about 4-6% better mileage, quicker starts, easier starts in very cold weather, etc. And my tanks are always clean.
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