Do you use Frontline?
google Frontline Plus MSDS
(it's a material safety data sheet)
look at the composition data
7-12% Fipronil
7-12 S-Methoprene
10-15% Ethanol
Frontline is fairly expensive.. iirc about $60 for a pack of about 12ml
You can find other Fipronil and S methoprene...