Since you want something that's odorless, there is only one product that we'll recommend. The Roach Gel is the only product that won't leave any type of smell once it's been applied. You can see it in our Roach Control Article and as the article explains, the roach gel is not only odorless and safe to use, it's actually one of the best roach control products available. This is because it uses a food lure roaches can't resist combined with an active ingredient that's highly active for a long period of time. Roaches that die from eating some will actually end up killing other roaches so there is a chain reaction benefit derived once some of it gets into the roach nests. Forget the Orthene WP and Aerosol sprays we have featured but instead use nothing but the gel and I'm sure you'll be satisfied.