There are residues of detergent on the clothes.
Some detergents contain ingredients which are not soluble in water and which may form white stains on your clothes.
1.
Ensure that the washing machine is level and if necessary adjust the feet.
For more information, see the Adjusting the feet topic.
2.
Carry out an additional Spin.
3.
When the clothes are dry, wipe off the stain with a brush.