I have the yellow conditioning brush and I have to admit that I'm a bit disappointed. The bristles are long and hard. If you turn your PC at a slower speed, none of the cake build up will come off. But if you put it on a higher speed, it'll come off along with little bits of your pad. I have
Meguiar's pads and I made my mistake the first time using it on a finishing pad. Later, when my burgundy cutting pad was ready to be thrown away, I used it on that and it also chewed up the cutting pad.
IMO, it's not worth the $12-$14 you'll be spending. If that's the route you want to go, I would find a soft bristle tooth brush or like someone mentioned, one of those brushes to clean your fingernails. I haven't tried any of these so I can't say if they would work, but I don't think the conditioning brush would work any better. The only positive thing about it is the nice, thick handle.
Since then, I have found that throwing the pads in the washer has been the best method for cleaning the pads. The stains
NXT left behind on the finishing pad never came off if I let it soak or hand washed it. But after one wash in the washer, the pad came out completely clean looking like new. Just make sure you only use warm water because some people's hot water will be hot enough to melt the glue on the back of the velcro backing, making it seperate from the foam. If this does happen, you can fix it, but obviously the bond won't be as strong or look as nice as new.
I don't think I'll ever try to clean a pad mid-detail again unless I had no other choice. It's probably best just to have multiple pads that you can switch to and clean at the end of the day.