Choose a natural shampoo that builds up a good lather to carry unwanted material away. Wash hair as you normally would by lathering and thoroughly getting into the scalp. Squeeze water out of the ends of your dreadlocks to help the drying process.
As your hair lengthens your wet dreadlocks will become increasly heavier. Sectioning your hair into for example four parts will make the task easier. Literally scrubbing your dreadlocks together in bunches will do wonders for throughly cleaning your hair.