John,
I have used a product on my Jeep called "Sea Foam". It does a great job on deposits and is safe. Depending on your level of deposits it will cause enormous amounts of smoke. Your neighbors will not love you and when you drive it people will think your car is a roach. But it does work. It is available at NAPA and I am sure all the usual parts stores.
http://www.seafoamsales.com/
Have fun !
Jeff
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.