How good is vagisil pH balanced, odour control formula feminine wash? I sometimes have fishy smell down there & it's annoying & embarrassing! I test ok

Good. There's no harm in the product you describe but it sounds like it's not clearing up your symptoms. An odor almost always means an elevation of your ph. Nearly 100% of the time. Sometimes the tests the doctors perform in their office aren't accurate (i.e. Looking under microscope). If I have a patient and their ph is elevated, i treat them for bacterial vaginosis even if micro is negative.