Demon Wp is not labeled to be applied in dishwasher and A/C ducts. It is very important that you read and follow the
product label to avoid contaminating sensitive areas. You can use a high quality roach bait gel such as the
Advion Roach Bait Gel to treat areas where spraying would not be appropriate (counter tops, cabinets, drawers, around dishwasher, a/c vent). The roaches will consume the bait and then go back to their nesting area and spread the bait which will help eliminate the roaches more quickly than spraying insecticides and IGRs alone. Getting rid of roaches is not a process that only takes only a few hours. Moderate roach infestations can take a few weeks to get rid of and severe infestations can take several months even when using all of the products needed (insecticide, IGR, roach bait) and sanitation is up to par.