I HAVE LAKE FRONT HOUSE, SPIDERS ARE ALWAYS A PROBLEM … THE QUESTION I HAVE IS HOW LONG DOES THE ECO EXEMPT CONCENTRATES LAST IF I SPRAY MY HOUSE ALL AROUND IN THE LATE SPRING THANKS B.H.
We've had people report residuals from two weeks to two months. It's really hard to say. After being in the business for over 30 years, I've learned residuals can vary from house to house based on what's going on locally, and most importantly, what's happening on the property being treated. In the end, I think it's mostly dependent on the local moisture levels and there really is no way to tell for sure other than to try.

More on eco ic length of residual for spiders