I had to wash my IKEA comforter this week, so I could put the duvet cover back on and because it hasn’t been washed, ever, since I bought almost six years ago. IKEA no longer sells this particular comforter, which they replaced with the Honsbar. I realized that I had no idea if it could even be washed, but surely the Internet knew! And it certainly did.
You can download the instructions for washing from IKEA, here. Scroll down until you see “Instructions & Other documents” and click on the highlighted text “Manuals.”
You can wash the comforters in water temperatures up to 60 ℃, or 140 ℉. You should use only ⅓ of the regular amount of laundry detergent. I washed mine using a Tide Pod because we are out of liquid detergent. It did not affect the duvet negatively in any way. You then dry on regular heat (although I only ever dry on low) and can put in some tennis balls to fluff it up as it drys, but the directions caution that some of the coloring from the balls could have transferred onto the duvet. I imagine that if you use dryer balls instead of dryer sheets, it isn’t an issue. I used neither, and it still fluffed up nicely.
My comforter had some stains on it of the animal/baby accident and suspiciously-like-mildew type. So I rubbed in some OxiClean and tossed it straight into the washer. The stains are completely gone (sorry, forgot to do a picture!) It smells brand new, and mildly of down. I’m quite pleased and am thinking about washing it twice a year, spring and fall.