Hi American Jambo,
Good question. Ingredients to avoid are:

1. Trimethylsilylamodimethicone
2. Amodimethicone
3. Cyclopentasiloxane
4. Cyclomethicone

These products deposit silicones and cause build-up over an extended period of time.
Also the following cause an even more rapid build-up:

1. Dimethicone
2. Cetyl Dimethicone
3. Cetearyl Methicone
4. Dimethiconol
5. Stearyl Dimethicone
Look for natural ingredients or:
1. Stearoxy Dimethicone
2. Behenoxy Dimethicone

Regards,
John