Metal roof problem

I just had my metal roof cleaned. Some of it turned black. What can I do to fix this problem?		John Meaux 7/10/2020	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/25051/find/
Can you post up some pictures?		Eric Novotny An informed customer is the Best Customer! 7/10/2020	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/25052/find/

If you would like to reply to this thread, please log in. If you do not have an Ask the Experts forum user account, create one here.