BS”D
Supposedly, Belz has a tradition not to eat something (forgot what) because back in Belz of old a barrel of it became contaminated right before Pesach.
Many of us in Chabad don’t eat dairy. I was told 100 times that we can (and that it is a minhag from specific shtetlach), but I don’t (other than in the morning before the first seder) even when I do have access to reliable dairy for Pesach. I’m not sure about radishes. I do use oil; others don’t. Also, unlike some Chassidim who drink slivovitz on Pesach, we don’t drink mashke. (And yes, the real old Russian Lubavitchers do pronounce Arba Koisos as Arba Cases – that is our regional pronunciation!)
Creedmoor adds bleach to their wine for the Arba Koisos. Red to them represents the innocent blood of Palestinians shed by the tzioinim, so they bleach it in order to make sure they are not drinking anything red. Of course, they could buy white wine, but if they did, they would not be Creedmoor.