I have had this heavy mountain for about five years now.  it run and pulls great.  I notice as of late that after applying power and reaching 30 to 40 percent this loco starts to squeal.  I have lube wheel bearing and the worm gears but I still get this squeal.  any other suggestion would be helpfull.
Also, I use a Zephyr with a UT1.
Also has any one very tried to use dawn dish soap on a q-tip to clean drive wheels, would like to know before I try.
thank for your time and suggestion.

to drhorn,
If you don't like cleaning track before running your trains, you will find that these work very great. 
I have two of these track guards.
I only clean my track once a month just to make sure every thing works good. 
I plan on getting a few more.
I would say try it I think you will like it.