Depending on how old your washer is and the condition of your water supply, it could be rust stains either from the washer tub starting to rust out. When a washer tub starts to rust out, it usually starts around the hundreds of small holes in the tub, as the coating wears away exposing the steel underneath, which rusts when it comes in contact with the wash water.
The other probable cause could be your water supply. If your water doesn't contain any rust or sediment, (fill a medium clear glass jar from the kitchen sink and let it sit undisturbed for a couple of days and see what settles to the bottom of the jar), it might be that your hot water heater tank is starting to fail and the tank is rusting out.
You can check the hot water tank by attaching a hose to the drain valve and filling a large bucket with some water. You might see some sediment and gunky water coming out of the tank, which could be the cause of the stains you're getting on the clothes.
It is recommended that homeowners with sediment in their water supply, or those on well water, have a whole house water filter to help keep sediment and minerals from getting into their appliances. Also, you should drain your hot water heater at least once a year to get rid of any excessive build-up in the tank. Be sure to turn off the hot water heater (electric or gas) when draning the tank and turn off the incoming cold water line too). Drain enough water out of it until the water runs clear.
Doing this will help extend the life of your water heater and make it run more efficiently too, as less sediment in the bottom of the tank means less effort is needed to heat the water, especially with a gas water heater.
Hope you found this info very helpful and best regards!
I had an engineer out for a similar problem and he suggested that it could be with using liquid detergent, went back to powder and no further problems
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