Tank Rinse Options

[NARP74]

I am moving my fuel pump and drained the tank for the hose hook up etc. I looked deep inside and noticed a little residue on the bottom. I am going to pull the screen too, might be more there.
Is there something to use to flush the tank that is not fuel?
This will be with the tank in place. I am NOT taking it out. Scope creep is killing me and I am already missing the best part of the driving season.

[flyer86d]

Our 73 911 sat for years after we had Jim Newton repaint it in 1988. The tank crudded up from sitting with old gas. The first go at it in 2000 was to pull the screen and clean it with brakekleen and we were able to drive it from New Jersey to Vermont and a few trips around the Valley. Then it spent the next 15 years in the garage except to pull it out, wash it, Sue would say let’s take it for a ride. Then no, what happens if we get a stone chip and back it goes into the garage for another year. We finally decided to sell in 2017 and the car would always quit, run rough, stall, etc. Replaced the fuel lines and tank screen fitting and flushed the tank with Muriatic acid. Worked great for a year then it started doing the same thing. Replaced the tank with a new one and problem solved. If your car is going to sit like ours did, fill the tank with 100LL avgas. Airplanes sit and a gas does not sour like auto gas does. Don’t run a gas in a car with cats as it has lead.

Good luck as this was a loooong road!

Charlie