Search results

You can also use muriatic acid which is 20-35% hydrochloric acid and easy to get. Sold at all hardware stores for cleaning concrete. Just use the same way described fir hydrochloric acid. I used this method on a welder gas tank and had good results. Just be careful as it is pretty potent stuff.

Vinegar can work well. It helps to first put a handful of drywall screws in the tank and shake it around to knock off the heavy stuff. Then let it soak overnight with regular vinegar. After you drain the vinegar fill it with water and baking soda solution to nutralize the acid. Rinse out with...