Do you have a product that will not damage my galvanized steel?
We have a barndominium- don't want to spray anything that will mess with the galvanized steel, but need to get rid of nests on porches.
One of our best products is Wasp-Freeze, which offers an instant knock down for wasps. Because it is an oil-based chemical, it may leave a bit of residue. However, you should be able to wash it with water to remove the residue.