Blue MAC is a Mechanically Accelerated Cleaner which eliminates stains other cleaners leave behind. It not only attacks the stain chemically but mechanically as well, without any damage to the mesh.
Simply apply Blue MAC to your dry mesh using one a shop towel. then allow to dwell for 10 minutes. A high pressure rinse followed by a low pressure flood rinse should leave your screen stain free, degreased, and ready for coating