acid cleaning meaning

[Engineering]
"The use of circulating acid to remove dirt, scale, or other foreign matter from the interior of a pipe."

Examples

1. efficient method and measure of silicic acid cleaning during the new unit preoperation
2. It is probably present in chromic acid cleaning mixtures along with the mixed chromosulfuric acid H 2 CrSO 7.
3. To clean the parts, applications of joint-weakening flux and expensive acid cleaning baths have traditionally been required.