Can I use hydrodrine porixide to douche or put inside my vagina to kill the oder or kill the trich infection. Just curious?

No. If one has been diagnosed with trichomonas, then one needs to take the prescribed antibiotic, flagyl, to kill it. If one has not been diagnosed with trich and there is a malodorous vaginal discharge then one needs to see a doc for evaluation as to the cause of the vaginal discharge. Do not douche with hydrogen peroxide.