I need advice from people who install carpet and will know this. I'm about to tear out carpet because the tape on the underside has mildew in various areas, or so I thought. I had a flooring guy look at it tonight though and he told me it is normal discoloration from the glue and seam iron. Another flooring company, who I do not trust, had originally said mildew. Not sure what to believe. Can anyone tell me if the iron/glue really does leave marks on the paper part of the tape that look like mildew?