Marcus M; Elgin, IL asks: Does a commercial hornet/bee spray leave a chemical stain on stained cedar siding? It's a huge debate here. Thanks!
Dear Marcus: The editors of Consumer Guide suggest removing chemical stains on wood by putting some dishwashing detergent in hot water and mixing to make a great volume of suds. Then, dip a cloth just in the foam only and apply to the stain. Rinse with a clean cloth moistened with clear water. Polish or wax as soon as possible.
That said, every pesticide container has an 800 phone number printed on the label. Call the number and ask the manufacturer about their product's test results regarding chemical stain on wood. Do this for each product you are thinking of using.
Pesticide manufacturer "help" lines can provide a plethora of information about every product they put on the market. Most commonly they receive questions about toxicity or poisoning issues, but they retain volumes of research on what their products do to wood, fabrics, plants, vegetables and anything else under the sun.
The Federal government requires chemical companies to jump through hoops before they are permitted to sell to the general public, which is a good thing. So, the person answering the 800 phone line is prepared to answer all your questions about wood stains.