Fleas are most likely not resistant to the chemicals like Tengard that you are using. Flea elimination can take several weeks and it is normal to keep seeing fleas even after the initial spray. Flea eggs and pupa are protected from all of the insecticides that you can use and they will not be exposed to the application until they reach the adult flea stage. Once the adult fleas are exposed to the application they will usually die within 24 hours. You should only treat once every 14 days and continue to vacuum every day. It is also very important to treat all pets and all outside areas where pets frequent to avoid reintroducing fleas to the indoor areas.
For Tengard SFR it states from the label not to use on animals under 12 weeks of age. The dilution rate states to use 1/4 fl. oz. to 1 1/4 gallons of water as a dip wash. Thoroughly wet the animal to skin with a sponge or rag and let drip dry. If signs of sensitivity occur, bathe your pet with mild soap and rinse with large amounts of water. You want to repeat applications every 2 weeks, if necessary.
The mixing ratio for Tengard SFR Termiticide Insecticide is 1 2/3 fl. oz. per gallon of water.
Yes, if the roaches and ants come to an area that has been treated with Tengard SFR Termiticide and Insecticide they will be eradicated. For more information on treating roaches and ants, please take a few moments to review our treatment articles on How to Get Rid of Ants and How to Get Rid of Roaches for a successful eradication program.
We do not have a product that is labeled for Cheyletiella mites specifically, but we do have a product that can be used for several types of mites including biting mites. Tengard SFR is labeled for mange mites and scabies mites and can be used indoors and outdoors and on certain types of animals including dogs (do NOT use on cats). We recommend that animals are seen by a veterinarian and treated according to the veterinarian's instructions.