Wash with Hands First:
In order to protect the tie-dye on your clothes wash them with hands for the first few times. Also keep in mind that you should wash such clothes or items in a bucket or a sink with laundry soap, which must be very mild.
Use Washing Machine:
After first few hand washes, you can use washing machine to wash them. However, wash tie-dye clothes separately from the other clothes, as there is still a chance that dye may still come out, which can easily get on other clothes, if washed together.
Keep the Load Smaller:
To save the tie-dye colour or lessen the chances of such colours to run out, wash such clothes with small load of laundry.
Use Cold Water to Wash:
You can use cold or warm water to wash tie-dye clothes, but hot water can cause serious damge to these colours.
After washing the tie-dye clothes either hang them in a line so they could dry out or you can also use a dryer for tumble dry.
When the tie-dye clothing gets dry, you can iron them to get rid of wrinkles and put on them normally as you wear other clothes.