The laundry tub may have been heavily soiled, so you may not be able to remove it all at once.
In that case, please rinse for 1 to 2 more cycles using the "Standard Course" or clean it again using the "Washing Tank Cleaner".
Dirt will come off more easily if you wash it with hot water at 40℃.
We recommend regular use once every 1 to 2 months to keep the washing tank clean.