Ways to Neutralize Chlorine in Wash Water

I think we just figured out that my teenager with MCS is very sensitive to the chlorine in our municipal water (used for washing clothes, of course). We are at a temporary location. When we find a place to move to, I planned on getting a whole house filter system which I have not researched yet. I do have a chlorine filter on the shower. Is there something we can do with the wash water for now?