Sent by Sonia
Editor - Sonia, we don't think Magic Sponge is going to work in this case because the stain has set into the material and Magic Sponge works by removing surface layer staining. Poster and print archivist mention using bleaching solutions carefully to remove discoloration, but this can be a tricky process, requiring the proper amount of solution and liquid. This website notes the process is best left to the hands of a professional restorer since the cleaning process requires dampening the poster.
Has anyone had success removing water stains with a DIY technique?
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