We have in our local bikers group a scientist, among the many interesting people. He took 
some rubber lubricant to work and analyzed it. Here are the results:

From:           	"Rick Clarke"
Organization:   	Abyss of Clutter
Date sent:      	Wed, 10 Nov 1999 17:33:45 -0400
Subject:        	Re: Home-brew tire lube


> 90-95% = water
> 5-7% = Potassium Vegetable Oil Soap
> 1-5% = ethylene glycol

I read the label a while back and started making my own. I used 
dishwashing liquid, which might be harsher than Murphy's oil soap. 
Murphy's sounds like a good choice.

At first I just used soap and water. I found that the lube would dry 
too quickly on hot summer days. I then added the glycol which 
depressed the vapor pressure sufficiently to keep the lube from 
drying until I had time to seat the bead, etc.

I don't recall if the glycol made the lube much slipperier.

-Rick

This works out to approximately:
29 oz water
2 oz Murphy's oil soap
1 oz antifreeze

Regards,
RonB