dirt / build up on front loader glass door
I've only used my new Kenmore Elite washer (a rebranded Samsung WF409) for about ~10 cycles and some weird build up is appearing on the glass door (pictures below). Whatever it is, it's extremely hard and 'baked' on... so hard and scratchy that at first touch it seems like maybe the glass is etched/scratched, but it is in fact some kind of build up. Has anyone else experienced this before? I tried some all-purpose cleaner and a good scrub, but not the slightest bit came off at all! The first time I saw the build up was after running a sanitize cycle with a shower curtain and detergent. The buildup at that time was only half as 'long' as it is now (in the pictures you can see the build up is kind of a strip). I did some warm/cold washes after this, and the build up did not increase or decrease. Then yesterday I did a hot wash of some white clothes, and noticed the build-up strip was twice as long! What's going on? How do I get it off? I'm using Tide HE detergent, if that helps. I tried a washer clean cycle with no detergent, but there was no change... the water doesn't really reach that part of the door much anyways... just some splashes during tumbling.