Product review (1 stars): Hey, I think I figured out how to fix this POS...
I recently moved into an apartment with this dryer, and like many other reviewers, I found it was completely worthless.  According to the manual, this thing is actually designed to NOT completely dry clothes, since that supposedly damages them.  However,  I prefer my clothes to be mildew-free, so here's what I did to get this thing to properly dry my clothes:

-Stop trying to clean the sensors with vinegar.  It's a complete waste of time--use the vinegar to clean your coffee maker or espresso machine instead.
- Next, open the panel below and to the left of the door and remove the plastic drawer-looking thing  after twisting the two tabs on the corners.  You won't be needing this thing anymore, but place it on top of the dryer or someplace nearby so it doesn't get lost/discarded.  Someone else who wants their clothes to smell like mildew may want this at a later date....
- Next, don't close that panel door if you want to do laundry.  Obviously, you can close it between loads, but you will always run the dryer with this panel open.  If your dryer is in a closet with a door, carefully make sure the closet door closes without slamming into the dryer panel door when it is open.  My unit is in a very small area and the closet door wouldn't close without hitting the panel door, so I cut a piece of string to a very specific length and then knotted it to make a loop so the panel door is open at about a 30 degree angle when looped around the panel latch and either of the metal pieces that make up the locking mechanism in the dryer door.  This may take some trial and error, and you can do it anyway you want, but the panel door absolutely needs to be open when you're doing laundry.  If you have a closet door, I'm just guessing you want that closet door to be closed, but obviously that is up to you.

- Next, take out the lint screen, remove any lint, and wash it with hot water and shake it off to dry.  Even if it looks clean, it may not be, so rinse it with hot water.

- This next step is optional, but I found it severely reduced the "filter" light warnings I was getting.  Turn the lint screen over and notice the screen mesh covers the hinged area in the base of it.  Take a razor blade and cut through the screen at the base (i.e., between the plastic along the hinged base).  This may not look like a big deal, but it will dramatically increase the airflow through the lint screen while still allowing the lint screen to function and collect lint.  Again, this part is optional (and it does permanently modify the lint screen), but I found it significantly reduced the number of times that the filter idiot light comes on.

- For regular maintenance, I only wash the lint screen with hot water and shake it out to dry when the filter light comes on.  I think the mesh is so fine that it gets clogged by stuff that's hard to see, so don't trust your eyes.  When the filter light comes on, take out the lint screen, remove any lint, wash it off with hot water, and shake it to dry.  Also, I used to rinse off the metal condenser thing in the drawer behind the open panel, but I don't think that matters, so I don't even do that any more, but if you run into any problems, you may want to rinse that off as well.

- Lastly, I always use the Regular/Cotton--Extra Dry setting, with the "Low Heat" push-button option selected.  Unfortunately, it can take an hour or more, but it always dries my clothes that way.  The clock is never right--it starts at 2:37 but then updates continuously and I'd say it takes about an hour or so,  I haven't tried a lot of the other settings, but they may work as well.

Hope this helps.  Feel free to add your experience/comments/thoughts/ tips below.