How old and how receptive to training are they?
I would maybe bring a small garbage can into a "training area" (living room or something) ... put it in front of them. Every time they go for it, firmly say "NO" and push them away if they don't get away themselves.
Also, I know Mogli never liked hot sauce (tobasco, etc). If I just had it on my finger he'd make a face something awful. If your babies react to something non-harmful like this, you could put some on or near the garbage. I think there's commercial products like no-chew type stuff with a similar effect.
They need a firm, completely deterring thing to be associated with the garbage so they can build that mental connection and live by it. |