Recently I found the garage smells moldy, I didn't figure out the reason for several months until yesterday. My wife found the washer has a lot of mold in its rubber ring. Gee, that smells really bad. So, I googled 'LG TROMM mold', it turns out it is a common problem of front loader washers. However, manufactories don't tell it to buyers. I saw someone had medical problems because the washer passes bacetari to clothes.
It seems like no good solution. According to some posts, you can use a cup of bleach and run the washer in Sanitary mode, once a week. Note, this cycle takes 1 hour 40 minutes and you have to waster electricity and water. And also never leave clothes in the washer for long time, and always open the washer door.
I am still waiting the 'Sanitary' cycle to complete, and now I feel itchy on my back. THINK before you buy a front-loader washer.