Dont overload the washing machine either.
Grease marks from washing machine. Oil doesnt mix with water so thats why you see spots on your clean clothes. Remove grease and oil from the surface of clothing before laundering. Meanwhile in a separate bowl mix a cup of white vinegar and a cup of baking soda to make a cleaning paste.
Run the washing machine on a full cycle with hot water. Remove the agitator according to your washers instructions manual and look under it to ensure there are no grease deposits remaining. The Dryer May Actually Be To Blame.
Leave the door open after the cycle is finished so the surface can air dry. It could be that the washing machine drum has collected greasy residue from previous loads. Wear an apron when cooking with oil.
The black spots could be mildew if you have allowed clothing to sit in the washer too long. The entry of water displaces oil in the transmission and forces it out through the seal and into the machine and stains the clothes. So to answer my question either provide a link which mentions that dryers can make these grease-type marks on clothing or a link which mentions that this can be caused by the washer.
A more common problem is transmission seal failure. Add 1 cup white vinegar to the wash cycle to remove any last traces of grease and oil and clean out the inner areas of the washing machine. You have a buildup of fabric softener that comes loose off to put a greasy like substance in your water and on your clothing.
Gently press and massage the clothing items until the entire dark spots vanish. Leave the door open after the cycle is finished so the surface can air dry. As the grease enters the tub it stains your clothes.