Tires and air

[Skip Higginbotham <Saltrat@lubricationdynamics.com>]

HELP!!!!!
My 30 X 18 M/T rear tires have started to leak at the sidewalls. I am 
losing about 10 psi overnight on both tires.
I have been told (by M/T) to coat the inside of the tires with 
Palmolive dish soap and then life will be good again. I wonder........
What else is out there? I have been surfing the net for a while now 
but find nothing I want to put into or on the tires to stop this leakage.

Any proven methods will be welcome.
Thanks,
Skip