How do you remove acid water from a drain line?

How do you remove acid water from a drain line? When you need to jet a kitchen line and they have poured draino or even worse sulfuric acid in there. Right now I use a shop vac on top of a 5 gallon bucket to empty the sink but what about the drain line going into the wall and into the basement?

Anyone have a undersink contraption to jet 1 1/2" lines to help against splashes and excess water coming back? I have a plan for one but I would like to know if anyone else has made one.

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