Washing Machine Door Seal Mildew

The Cause Of Black Marks & Mildew On Washing Machine Door Seals

This, as shown in an extreme example in the photograph to the right, is caused by a bacteriological build-up in your machine due to poor cleaning. It really is that simple and, all too often, it is caused by incorrect detergent use.

What happens is that under-dosing or using the incorrect detergent for too long without performing a maintenance wash will allow bacteria to build up in the washing machine which will grow very happily in the warm damp conditions which will eventually lead to what is shown here on the door seal or door rubber as some people call it.

Black mildew marks on a washing machine door seal

Also using solely liquid detergents, liquid tablets, colour only powders (or liquid) as well as most of the "alternative"products like Soapnuts, Ecoballs and Ecover do NOT contain any bleach and will not remove any bacteria effectively. Should you wish to use these alternative products you will also have to add bleach to prevent "greying" of your whites over time as well as other problems.

You can read much more on these natural products in this article

Leaving the machine door slightly ajar when not in use also massively helps as this allows the seal to dry out and hinders the growth of bacteria inside the washing machine's drum as well as the door seal.

The Effects On Your Washing Machine And The Cure

As you can see from the photograph the effects are extremely visible and noticeable to the naked eye and, whilst a maintenance wash will help the situations, depending on how bad it is there may well be no alternative but to replace the door seal. On most washing machines you can expect to pay about £60-80 to have this done by an engineer using the engineer search if it really is bad.

Ultimately the only real cure is a replacement door seal on the washing machine and regular maintenance washes thereafter.

But before you call an engineer in try cleaning the seal with a little bleach solution and a cloth, it may clear it if it's not too bad.

There have been some reports of other cleaning products working in some instances, but these are sketchy at best for the most part and it is very hard to get into the crevices of the door seal to get it clean.

In cases where this does happen, I'm afraid that almost every time it's too late by the time that you do something about it and there is little alternative bar a replacement door seal and that prevention is better that the cure. Of course you can find a replacemnet door seal for your washing machine in our washing machine spares section.

Affresh washing machine cleanerTo keep your door seal clean we can recommend the use of Affresh. We're not saying that it will cure every single cases because, as we said, if it is really bad already the only solution is to replace the door seal, but as a preventative cure and the general health of your washing machine it is very good.

More On Washing Machine Cleaning

You can find more, as well as related, information on the effects of not carrying out a maintenance wash from the following articles:

Smelly Washing Machines how to avoid nasty smells and get rid of them

Washing Machine Soap Drawers how to clean them to avoid smells and bacteria build ups

Maintenance Wash What it is and why it is important

Whiter Whites, Brighter Colours how to use detergents correctly.


-1 #9 louise costello 2015-06-27 22:42
Washing machine making grey oil like large marks on clothes, cleaned and boil washed but still doing it, only on 40degree or less wash?
-1 #8 louise costello 2015-06-27 22:39
Washing keeps coming out on 40degree wash with large grey oil looking marks cleaned washer, boil washed and done again but still doing , does any one know what this could be pls
+4 #7 Langford 2015-01-13 00:35
Sludge on clothes. Have tried Clr, vinegar and even dishwasher cleaner. Still keeps coming back. Cleaned soap dispenser etc. any suggestions.
-3 #6 Kenneth Watt 2014-08-15 14:15
Yes it is probably gunk inside the machine that has built up over time.

You can try running a maintenance wash or use Affresh to try to clear it. How long that will take is hard to say as it depends on how gubked up the machine is inside.
+5 #5 Griffin 2014-08-15 14:09
I have small black marks on my white washing when I -do a hot white wash is this a bacteria can you tell me what to buy to cure the problem
+1 #4 Brian j 2014-01-28 10:37
my hotpoint washing machine door will not open have tried several cycles but no joy
+1 #3 Nualah 2013-10-19 12:04
My washing machine has started to get a burning smoky kind of smell when I use it. The plug doesn't feel hot so I'm thinking could it be the heating element and is it safe to carry on using it. Everything else works fine.
+1 #2 Diane9 2013-06-11 23:54
This is a fabulous site. Thank you for taking the trouble to put this information on here. Single Mum and just fixed my machine. Thanks :).
0 #1 Fox John M 2013-03-16 11:54
Hope this is the correct box. I have a Bosh avantixx dish washer.....I have checked my machine but can not find any where the model no and batch no.....any help would be much appreciated.

John M. Fox

Add comment

Please do not use the comments box if you need the following.
With notes on where to get the best help at the end of each line:
Spares Help - From the store "Contact Us" option or spares@ukwhitegoods.co.uk
Technical Help & Support - Please use the forums
How To Repair Problems - Please use the forums

Security code



Appliance spares for washing machines, washer dryers, cookers, ovens, hoods, dishwashers and all other major appliances

Get spare parts in our store

email us on spares@ukwhitegoods.co.uk for spare parts

Or call on 0845 172 8002

Pay for spare parts using all major credit and debit cards and also instant ant payments using PayPal and Amazon for parts

Find Local Service Engineers

Find a domestic appliance service engineer to repair your washing machine, dishwasher, cooker, oven, fridge or any other major domestic appliance
Find a local approved service engineer to repair your

Forum Support

Appliance help and support forums where you can talk to actual domestic appliance engineers about washing machines, cookers, dishwashers, fridge freezers and more
Get help from experts in our forums

Can't Find It? Need More Help With Your

Getting help, buying spare parts or knowing how to care for your can be difficult and you may not have been given the best information to look after your applainces well, we give you the best advice possible on how to care for your applainces.

Get technical help for your washing machine, dishwasher, cooker and other appliances in our help and support forums To get more help with a then please click here for our help and support forums
Get spares help and advice for washing machines, dishwashers, ovens, tumble dryers and more from our spare parts experts Contact us for spare parts or care and cleaning products for appliances using our online contact form, simply click this link to get in touch

Get More Help And Information

Get more information on care, maintenance, spare parts and repairs using the custom Google search below which will search our forums, the spare parts store and all articles.