Voted Best Answer
Jul 24, 2013 - 09:54 PM
Bifen and Demand CS will not affect the vinyl siding or leave any visible residue. Just use as directed, and you should be fine.
What happens sometimes, is that when you start spraying, dirt residue that is on the siding starts streaking down the siding. For this reason, you may want to clean the siding first, power wash, or scrub it and rinse it, and then apply the product.
Hope this helps.