I do Affresh regularly and yes I use cold water for colors. This is not an owner issue. Disassembling a washer is not a simple task.

I would also always leave the lid up from use to use.

If this washer is part of a rental property, your renting..than you are going to have to go to the owner and tell them the machine has mold and needs to be resolved asap.

It's a 2009 model year. The serial number is coded for the year and week of manufacture. The only way you're going to get at the residue is disassemble.

Disconnect the power cord. Press a putty knife or other thin blade into the seam between the top deck and front panel at about 4-1/2" to 6-1/2" from both corners to release the latches while pulling upward on the top. There's a positioning block nearer the corners so don't confuse it for the spring latches. May have to probe in the seam to find the latches. Some water may spill from the dispensers when the top is raised, maybe place small cloths into the dispensers to absorb it.

Have a helper hold the top up. Remove the recirculation hose from the tub cover (should be at the left/rear). Find and release the several latches that secure the tub cover to the tub. Press down on the tub cover at each latch to help release it. You can then clean the underside of the tub cover and as far down as you can reach around the inner drum. Be careful of sharp tabs on the outside of the inner drum at the perforations.

Disassemble or replace.

I used bleach, hot water and 6 packets of Affresh trying to get mold off the gasket of my sister's FL. That didn't even come close to removing all the mold.

Gasket -- which is inside and washer and exposed -- had to be replaced which required partial disassembly of the washer and two very strong guys. No way Affresh will remove something not in the tub.

To help with gasket mold, apply Cascade gel because it has bleach in it. Coat the gasket well all around and let it sit several hours or overnight. Then wash off with hot water and a rag. The gel/ liquid is thick enough to stay on the gasket and not run off.

Just out of curiosity, was the lid to the washer kept open or closed when not is use?

Regards to that video, ALL washers retain some water. Older designs had it in the pump and hoses below the tub but it was still there, accumulating mold where it couldn't be seen without disassembly further than what's shown.

Use of chlorine bleach on a recurring basis, such a weekly whites load, helps prevent mold.

Removing the screws from the rear hinges is an alternate method of raising the top, without depressing the spring clips at the front.

The inner drum/basket doesn't always readily come out, sometimes they get stuck to the drive shaft. There's a trick involving a 2x4 and a car jack to get it loose, or a $pecial tool is available.

I have a mold problem in my Whirlpool. About 7 years old and it’s been used a lot. Saw water leaking from inside the tub in the top back area. Took a mirror to the under side ring and there was red mold. There is plastic tubing that had calcification on it. Having severe allergy problems: breathing, hives, shortness of breath. Love the washing machine but not taking any chances because you would have to take the washing machine apart to see if the mold was sitting in the bottom of the tank. I can always here water sitting at the bottom after each wash when I swisch the drum around. Ordered another Whirlpool to loader. I will be following the instructions on cleaning it at least once a month to keep mold at bay.

@Kathy Strube, you didn't cite the model number of your Whirlpool ... but the water sloshing noise you hear may be a gyroscopic balance ring affixed to the top of spin drum. It's half-filled with water sealed-in at the factory. Your new machine will also have a similar balance ring. Some toploader models may have a balance ring at both the top and bottom of the drum. Frontloaders have it at the front of the drum. Balance rings aren't something new. Whirlpool toploaders have had one since the early 1980s. DO NOT attempt to puncture the balance ring and drain the water out of it, the machine won't function properly without the gyroscopic effect of it.