copper question

[Red Coral Aquariums]

I was just asked a copper question by a customer and was not 100% sure the answer and thought I would put it up for open discussion.

The person is downsizing from 200 gallons to 65 gallon system in about 1 month. He had used the 65 as a Q-tank and has had copper in it about 2 months ago.

What would it take to get rid of the copper?? ( He wants it to be a reef)
( getting a new tank is not an option)

My suggestions were;

Multiple hot water scrubbings and rinses then fill with water from his main system and after 3 days test for copper if it is detectable repeat process.

Would bleach work???

Any suggestions would be appreciated and I would request this thread stays on topic.

Thanks
Kevin