Good morning. Thankful for all the great ideas and suggestions we have found on this site. Curious if you have any ideas or suggestions on what these brown spots (pics 1-2) that seem to be spreading all over the plaster. We are also getting some black spots (pics 3-4) as well but not spreading as bad as the brown ones pictured. Leslies said the brown spots may be metal stains and said to rub an orange on it but that didn’t help. They don’t scrub off so didn’t think it was algae or mold? Thoughts? Thanks in advance!