I've read in many places across the internet that powdered milk will
greatly accelerate the rotting.

I drilled 1/4" holes all over mine and then wet it down. Then sprinkled it
liberally with powdered milk.

I don't know if it really did anything, but it did rot pretty quick.

I strongly suspect that drilling 1/4" holes all over it and putting *anything*,

or even nothing, in them would greatly accellerate rotting.