Dirty Gas Tank Help?????

I used water soluble parts cleaner, and chain. Chain link diameter of about 1/8". Made plugs for the tank holes from flexible plastic shipping foam. Get help to slosh the tank, it gets heavy with a few inches of water/cleaner. I used Dawn and hot water as the final rinse. Dry open, in hot sun. Results were excellent, looked new inside.

I saved the drain mixtures for hazardous waste disposal.