Normally it should be fine to clean a bed topper in a washing machine on the delicate cycle and then air dry it afterwards. The main problem is that a topper with the dimensions you describe is too bulky/heavy for a standard household washing machine.
Check out the self-serve launderettes near to where you live. They often have extra-large capacity machines, you should be able to wash the topper in the low 2-digit range. Which is certainly better than the 400 CHF you were quoted.
Thanks all for the answers, the topper is a kind of synthetic fibers, i think it can go into a washing machine, but the problem is exactly what you said, it doesn't fit in our washing machine. I mean, you can squeeze it in, but it doesn't make sense, i think as a rule of thumb you should leave 1/4 (or more) empty space in every load.
But it looks like Lea's launderette in Zurich could be a solution . I'll update as soon as i try it.
Btw, do you know if detergent pods (not powder/liquid) are also ok to use in launderettes?
Mattress protector. Goes on top of the mattress, designed to be machine washable. Sheets go on top of the topper. Our washing machine isn't particular big, but our mattress toppers wash fine in it.
I am not sure what the name is but there's a place in the same building as Micasa in Duebendorf. They had huge machines designed exactly for such bulky items. Maybe they could offer something cheaper...
We also receive from time to time a leaflet in our mailbox that some comapny is conducting mattress cleaning in the area on certain days but never kept the leaflet... sorry...
Depends - some are foam and can't be washed. And depends on thickeness and weight when wet- and size... 200 x 200 is very big. I wouldn't ruin my washing machine and would prefer to go to launderette with XL machines- unless it is one of those thin padded protector. I have one on a KS guest bed which is nearly 10cm thick- just not possible.
Not worth rutining your machine- or having to pay for a new one if you are renting.
Limits for washing machines are usually given as dry weights, not volumes.
A lot of the volume of the topper will be air. When it is in the machine, that air will be forced out of the fibres and it will take up a lot less volume than the dry article.
Personally, I'd stuff it in your machine and just wash the thing. You could always wash it twice.
You could always wash it in the bath and rinse it in the machine (if you lived in a house with boat sails, paragliders and tents, you'll realist you can get quite a bit in the bath!)
IKEA mattress pads protect your mattress and offer you an extra layer of comfort. The foam padding gives you a softer sleeping surface and a more comfortable bed. To air it, simply remove it and wash the cover in your washing machine.
The weight of a load will ruin the machine, not the volume.
The OP just needs to weight the topper and then check whether that exceeds the machine's capacity as stated in the manual. If it doesn't then it won't 'break' the machine.
Modern machines have load detection anyway and will refuse to run if the load weight is too great.
It’s the density that will determine the weight/volume.
A down mattress topper will weigh much more than a synthetic one of the same volume.
Ours weighs less than the 9kg maximum for our machine so it would be fine from that perspective but would be impossible to stuff into the drum due to the volume.
The weight is the most important factor as far as damaging the washing machine is concerned.