Ingredients

Sulphates to avoid include:

Sodium Lauryl/Laureth/Myreth Sulphate

Ammonium Lauryl/Laureth Sulphate

Sodium C14-16 Olefin Sulphonate

TEA Lauryl Sulphate, TEA Dodecylbenzenesulphonate

Ammonium/Sodium Xylenesulphonate

Ethyl PEG-15 Cocamine Sulphate

Sodium Cocoyl Sarcosinate

The following are gentle surfactants and are recommended instead of sulphates:

Cocamidopropyl Betaine

Coco Betaine

Cocoamphoacetate

Cocoamphodipropionate

Disodium Cocoamphodiacetate or Cocoamphodipropionate

Lauroamphoacetate

Sodium Cocoyl Isethionate 

Silicones that cause build-up

Anything ending in -cone, -conol, -col or -xane should be avoided. In particular the following which are not soluble in water and will build up, needed a sulphate shampoo to remove:

Dimethicone

Dimethiconol

Stearyl/Cetyl Dimethicone

Cetearyl Methicone

Amodimethicone

Cyclomethicone/Cyclopentasiloxane

Trimethylsilylamodimethicone

(the last three repel further deposits and therefore won't build-up but are still not water-soluble)

The only exception to this is when any of the above are prefixed with PEG- or PPG- which means they have been adapted and are water-soluble.

Water-soluble (good) silicones:

Dimethicone Copolyol

Hydrolyzed Wheat Protein Hydroxypropyl Polysiloxane

Lauryl Methicone Copolyo