i did the same thing as 20vanda01 did. when i got the car, may mga ants sa loob ng car, very small ants na namamahay na doon. i generously sprayed baygon original formula in car (but not on the surfaces) especially on the corners and places ants crawl. i let it stay overnight all closed. the next day, i saw tepok na lahat ng insects. i drove it on my driving training sessions, at nung marunong na ako saka ko pina sound setup then interior detail. then after which, saka na yung mga ibang stuff like california scents, ambi pur, ionizer, etc.
di naman na nagkakaroon ng insects sa car, occasional nalang like talagang nakapasok while door is open, etc. which nakukuha naman sa hampas o palabasin.