I've never had to clean a tank but had to clean metal parts at a machine shop I used to work at. Soap and water to clean the oil and crud off the parts and the rinse with water and then denatured ethanol to get rid of the water.
Alcohol will absorb water on the molecular level and evaporate much quicker. If it were me I would rinse with water as you described and then with half a bottle of 91% rubbing alcohol and air then again with alcohol.
Alcohol will absorb water on the molecular level and evaporate much quicker. If it were me I would rinse with water as you described and then with half a bottle of 91% rubbing alcohol and air then again with alcohol.
