Brown lines on clothes (whites and lights) from the dryer

check the drum on both ends to see if the felt wore down or ripped,when this happens your clothes can get into the space and causes the marks on your clothes,also check to see if anything is on the drum,door or back wall,anywhere that the clothes can touch as they spin in the dryer but most likely there's a worn out felt on the drum and clothes are slipping though the space

sounds like the felt liner, here is a website that will help,Tim:

http://www.partselect.com/dryer+dryer-tears-clothes+repair.htm

Most likely burn marks. maybe your dryer is getting too hot for your light clothes .

O.K. Here it is, I solved it. After calling whirlpool who was of no help at all, reading all links about the Duet washer and/or the Duet dryer, I finally solved the problem myself. I too, thought it was the washer but, upon close inspection, found the felt on the dryer had worn out in one spot. The thin brown lines always showed up on whites and more so on anything very thin. I took the dryer apart and found a small burn line on the drum (brown and thin). I replaced the felt ($60) and used Simple Green to clean off the brown. Works perfect, no more thin brown lines. If you can't take the dryer apart, I called for repair and found the price with parts to average $250.
I was ready to sell the darn thing after it ruined about $300 worth of clothes. All in all, it's been three weeks and still working fine.

I just noticed My Frigidaire doing the same thing. Using a lightly soapy damp cloth, I cleaned the interior, paying particular attention to the small gap between the drum and the housing. I also took apart the lint pre-filter and screen and cleaned them. There was a filmy build up of the same colored substance. I suspect that dryer sheets are leaving a waxy residue that over time is sufficient enough to rub off on lighter colored, primarily synthetic, fabrics.

Run a rag along the inside drum seals to see if this is the source of the brown lines. Replace the front and rear drum seals. Part number is 280114.

If it's gunk or build up the marks should wash away. In this case run a long cycle using "affresh" or "washer fresh" with an empty load and use the hottest water available to help rinse the gunk out.

If the marks do not wash away, it could be grease due to a bearing failure. Listen for loud growling or grinding either by spinning the drum by hand or putting it into a spin cycle. If this is the case, the rear tub assembly (contains bearing) will need to be replaced. Not much can be done about the ruined clothes :(

Hot spots in the drum perhaps. Check for a loose heating element.

To all victims of the brownish colored streak marks: I share your frustration!!! I have the same problem with my dryer which started when my dryer was only 3 or 4 years old - - totally unacceptable for an expensive top of the line dryer! A repair guy showed me how the brownish streak marks come from the felt liner which goes around the drum. Look inside your dryer for the beige or tan colored felt which sticks out around the circular drum. If you rub the felt with an old white t-shirt or paper towel, you will see the same brownish colored marks. My repairman recommended getting the felt replaced eventually, but until then, he gave me the following tips which really help avoid getting the streaks: For white or light colored clothes susceptible to the brownish streak marks: I dry these items as part of a very lightweight dryer load - with just a few other lightweight items. By doing a small lightweight load, clothing is less likely to get caught up & rub against the felt edges. For example, I dry 4 light colored men's dress shirts with 2 or 3 other lightweight shirts. OR for white or light colored athletic "dry fit" type athletic apparel, I dry 6 - 8 total lightweight shirts/shorts. If I throw my white Nike top or white pair of summer pants into the dryer with all my "whites", they will be doomed to getting brownish streaks due to the heavy load pushing them against the darned felt liner! Whenever possible, I wash susceptible items on permanent press to avoid wrinkling, then hang dry. Prior to putting these clothes in the dryer, I also "pre-clean" the felt with an old white cotton t-shirt by reaching into the dryer and rubbing along the felt edges until I'm not getting as much brownish color on the t-shirt rag. For a permanent fix, call a repairman or see the following do-it-yourself YouTube video on "Dryer Repair - Replacing the Lower Front Drum Felt Seal": http://www.youtube.com/watch?v=XoYP_YsGP68 . I have a repair person coming today to fix 2 other appliances, so I'm finally getting my dryer fixed, and I will post an update soon.