How can one prevent a tube from sticking to the inside of a tire? I was cleaning my cruiser today, and as part of that I removed the tires from the rims to give them a good scrubbing. As sometimes happens, the tubes were stuck to the insides of the tires. (This also happens with some of my other bikes sometimes.)

While I was able to slowly peel the deflated tubes away from the tires, this can't be good for them! Is there a way that this can be avoided when reinstalling the tubes and tires onto the rims? This bike has had slow leaks in the past, and I'd like to take precautions against that happening again.
Baby powder works great and is very inexpensive.