I am in the middle of a 12 story construction clean up job. It is going way to slow because of whats been described as concrete sealant that was sprayed on the outer surface of the building and landed on windows. Have tried Titan green and Oil Flow which seems to help a little. Have been told that citrus based stripper product may help. Looking for advice.
from Window Cleaning Resource http://ift.tt/1HoPiXp
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