Step 1: Pour 25ml white vinegar into the basin (white vinegar can decompose the residual detergent dirt on clothes).

Step 2: Soak the clothes stained with traces of white washing powder in a basin for 10 minute.

Step 3: Wash off the white traces of washing powder on clothes by hand.

Step 4: After scrubbing, put the clothes into the basin and clean them.

Step 5: The white marks left by washing clothes have been removed.