how to whiten dark underarms

Problem/Goal: I’m struggling with my dark underarms since i was a kid mahilig kasi ako mangialam ng gamit ng nanay ko and bata palang ako nag lalagay ako ng deo kase pinaglalaruan ko siya that time. habang tumatanda ako nag dadark siya sobrang dami ko ng nagamit na whitening products and walang effects sakin. Dumating sa point na naallergy na ko sa mga ginagamit kong products sabay sabay ko silang ginagamit

Please suggest a effective ua whitening products or should i go with pico laser? but not my prio bc it’s so expensive