Industry estimates say about 85% of U.S. homes have hard water. Most owners never test it, and every hot cycle can leave more scale on the parts they cannot see.
After all these years, this still surprises me, but some of the worst buildup I find is inside machines that seem to work perfectly fine.
The dishwasher turns on, sounds normal, and the tub looks clean. Meanwhile, hard water scale can be building below the filter, inside the spray arms, and around parts you never knew existed.
“When did you last clean the dishwasher itself?”
Most people cannot remember ever doing it.
They clean their dishes every day, but never clean the machine that washes them.
Some machines go three, five, or even ten years without one real deep clean.
That buildup does not stay harmless. It can weaken the spray, trap grease and food, make the machine work harder, and lead to bad smells, residue, a $300 to $400 service call, or even a new dishwasher.
Now think about this.
Affresh is a Whirlpool brand. The same company that sells dishwashers also sells you a cleaner for the buildup those machines collect.
They make money when you buy the dishwasher. Then they make money again because the dishwasher does not clean itself.
But Affresh, Finish, and most store cleaners are not magic. They may help with a bit of odor or light film, but old hard water buildup is a much harder problem.
Once hard water buildup has sat for months or years, one basic tablet may not remove the full layer hidden deep inside.
Most people judge the dishwasher by the tub they can see. That tells you almost nothing about what is sitting below the filter or behind the seals.
I have opened clean looking machines and found chalky scale and greasy sludge underneath.
The tub can look fine while hidden parts have been collecting dirt for years.
Think about an old showerhead. It still works, but some holes spray weakly or in the wrong direction.
Hard water can do the same thing to a dishwasher spray arm. The cycle finishes, but less water reaches the dishes where it should.
More detergent will not fix weak water flow.
Hard water leaves a rough layer. Grease, detergent film, and small pieces of food stick to it much more easily.
Then each hot cycle bakes the mess together. That is why a stale smell can return even after the tub was wiped clean.
What started as light scale can become a hard, dirty coating.
During a cycle, the dishwasher keeps moving water around the same machine.
If that water passes over scale, grease, and old residue, part of the mess can be carried back onto the plates, glasses, and forks you use.
That cloudy film or gritty edge is not just ugly. It is what the machine left behind. You don't want to see it, trust me.
By the time people call me, they have often changed detergent, washed loads twice, and decided the pump must be failing.
Sometimes a part is broken. Other times, a working dishwasher only feels weak because it has never been properly cleaned.
Before paying for a repair or a new machine, clean the dishwasher first.
The pump and heater still have to do their jobs even when the parts around them are coated in scale and residue.
The dishwasher may keep running, but weaker results often mean longer cycles or washing the same load twice.
That extra work adds up over time.
Hard water is not the only reason a dishwasher fails. But years of scale on the parts that move and heat water do not help it last.
I have seen people replace a machine they never once deep cleaned. The new one then starts collecting the same minerals from day one.
Cleaning buildup now costs far less than replacing another dishwasher later.
Clean hidden hard water scale, grease, detergent film, and food residue with one tablet and one hot cycle.
TRY DEEPRINSE RISK FREEUse DeepRinse once or twice per month. Once a month is usually enough for normal use. Use it twice a month if you have very hard water, run the dishwasher often, or notice residue and bad smells returning quickly.
Yes. Remove the dishes, place one tablet inside the empty dishwasher, and run one hot cycle. DeepRinse is made to clean the machine itself, not the dishes inside it.
Start with one hot cycle. If the dishwasher has years of heavy scale, grease, or odor buildup, a second cleaning cycle may be needed.
No. Dish detergent is made to remove food from plates and glasses. DeepRinse is made for buildup inside the dishwasher, including hard water scale, grease, detergent film, and food residue hiding around internal parts.
No. A water softener changes the water entering your home. DeepRinse targets the buildup already collecting inside your dishwasher.
No cleaner can repair a failed pump, heater, valve, hose, or electrical part. DeepRinse is for cleaning related buildup that can make a working dishwasher smell bad or clean less effectively.
Every dishwasher and water supply is different. DeepRinse is covered by a 60 Day Money Back Guarantee.
The 85% hard water figure is a widely used U.S. water industry estimate. Water hardness varies by location and water supply.
Affresh products are owned and distributed by Whirlpool Corporation.
Individual results vary based on water hardness, dishwasher age, machine condition, past care, and the amount of buildup present.