Question

the best way to test for leaks on cylinders is by using soaps and detergents. they should not contain _. however.
dirt or grime
oil or grease
water
other types of gases

Explanation:

Soaps and detergents are used with water to test for leaks on cylinders. They create bubbles when there is a leak. Oil, grease, dirt, grime and other gases are not used in this testing method.

Answer:

Water