Chosen Solution

The wide grey rubber gasket is growing black mold or mildew ( I think). on the underneath side..I wipe my machine down and always leave the door open when I’m finished with laundry. But this I’m just so upset about it.Please help! Can it be replaced?

In most cases yes. It depends on the age of your machine and on whether it is still supported by its manufacturer. Contact you local dealers and give them model and serial number and they’ll tell you whether replacement is available and at what price. Often this information can be found on web sites.