Other than choosing each one and clearing it? I just want to wipe them all in one go
if you’re MD has drive+ you can switch/reset a snapshot for an open palette. if not, you could do an “empty reset” which would clear all kits, patterns, songs and global settings from your MD. more info on that in the manual around pg. 83
also you could make a sysex file thats like a starting point for you that you could reload to restart or something