TwinDos - using your own detergent

I have mixed feelings about this auto dosing. On the one hand it's been a long time coming. I would guess that most people don't put the correct amount of detergent in. They'll put too much, or too little. This can cause damage to the washing machine over the years. But on the other hand, any system that locks you into using the manufacturer's detergent is a bad idea for consumers.

My other concern is if the detergent used in auto dosing is liquid detergent, which is bad. Liquid detergent is known to contribute to the buildup of washing machine smells, grease and grime because it doesn't contain any bleaching agents. If this has changed, I haven't heard, but it would be welcome.

As for not being covered under guarantee. That should only apply if a fault can be shown to be directly caused by not using their detergents. Any unrelated fault should be unaffected.

We should always be very wary about buying any product that ties us in to using the manufacturer's own consumables. Especially when those consumables are a vital component to using the product. I can't say how advisable it is to use something else because I haven't studied a washing machine fitted with it. But I would assume if you use detergent with the similar consistency to the original, it shouldn't cause any physical problems. At the end of the day Miele is a high quality product so it's not ideal to use cheap detergent. If you try replacing it make sure you use good quality detergent.

which is the best kind of washing machine detergent? (liquid, powder, eco, biological?)