Cleaning curtains

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I am having a problem cleaning the white salon curtains. I tried a bleach solution, but it appears a residue of mold will not come out of the material. Any suggestions would be appreciated. Thank you.

 

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I am having a problem cleaning the white salon curtains. I tried a bleach solution, but it appears a residue of mold will not come out of the material. Any suggestions would be appreciated. Thank you.

If the bleach doesnt work you will need to replace the curtains... if its an organic material such as cotton, any acid solution will eat the material.