Written Memory foam has an open cell structure. When you wash it the water gets in to all the little holes and doesn't dry.  It takes a long time for it to dry out and in the time it takes mold and other things can start growing.The foam is also likely to fall apart.Here is a link to a site that gives suggestions on how to clean memory foam without putting it in a machine. /...Written Foam doesn't hold up well when it gets wet. It starts getting crumbly and brittle. Think how a kitchen sponge gets after too many uses. There are a lot of air cells in memory foam. Water can get into those cells and mess up the structure. It's recommended to use a waterproof mattress protector over the mattress and any memory foam topper you might have. The warnings against getting the topper wet doesn't apply to just the washing machine. That also applies to perspiration, drinks, or any other "wet spots" that might occur. This will damage the memory foam. That's why you should use the protector and wash that.

/reas...Written NASA -style Memory Foam.Sponge Memory Foam.Nonflammable Sponge Memory FoamGel Sponge Memory Foam NASA-style Memory FoamSponge Memory Foam Nonflammable Sponge Memory FoamGel Sponge Memory FoamWritten Memory foam is a soft urethane foam engineered to spring back more slowly than regular foam allowing it to conform to things resting on it. Truck Seat Covers Nashville TnThere is a temperature component to the conforming property so it conforms better to warm surfaces. Car Covers For Hail AustraliaThere are numerous problems with washing the material. Chinese Hot Tub ControllerIt is an open cell foam so all of the cells connect allowing the material to become saturated. Water, at 64 lbs/cu ft, inside this matrix can make it too heavy to pick up.

I imagine the spin cycle on your washer could destroy the machine before it can remove enough moisture. Trying to remove it wet may also tear the foam. Any treatments that were applied to the foam will be reduced or removed. Should you make it through the wash the dry cycle can be equally destructive. If you have one of the gel foam pads the gel component can not stand up to high heat like the foam can. If you compromise the gel cells the comfort level of the foam can go down drastically.If,as you say, the pad has already absorbed enough to be verging on disgusting then you have nothing to lose in the attempt if you monitor your washer and are prepared to shut it off quickly. Some sort of wringer and the hanging it out might be a better choice than a dryer. As far as what else you can do, we have found that a thin high quality mattress cover can keep the topper relatively clean to increase its useful life. Good luck and be sure to video.4-inch Dual Layer Mattress Topper Does the idea of sleeping on a puffy cloud sound heavenly to you?

This two-layer mattress topper adds 2 inches of fluffy fiber-fill in a soft quilted cover to 2 inches of cooling gel memory foam, for unbeatable comfort combined with gentle, pressure-relieving support. Don’t be surprised if you sleep through your alarm. And did we mention that the cover is easy to remove and completely washer and dryer safe? Create a luxurious bed for a price you can afford. Like sleeping on a cloud for unbeatable comfort and gentle support – affordable luxury. 2 inches of cooling gel memory foam layered with 2 inches of fluffy fiber-fill, for deeper sleep Snug-fit cover that’s removable and washer and dryer safe For side, back or stomach sleepers Always holds its shape – 10 yr limited warranty – Foam made in USA 2-inch SureTemp Memory Foam Mattress Topper 2-inch Memory Foam Mattress Topper – Twin XL Sleep Innovations Sleep Builder Sleep Innovations® Mattress Selector If you’ll answer a few questions about how you sleep, we’ll recommend the mattress that fits you best.

Who will be sleeping on the mattress ... Me and my partner I would like the mattress to be ... I tend to sleep on my ... All Over The Place I prefer to sleep ... Depends on the day I would describe my weight as ... About right for my height Above average for my height Below Average for my height My partner tends to sleep on their ... All over the place My partner prefers to sleep ... Sleep Innovations® Pillow Selector If you’ll answer a few questions about your sleep and pillow preferences, we’ll recommend the pillow that fits you best. Where will you use your pillow ... What comfort level are you looking for ... I want my pillow to be ... Sleep Innovations® Topper Selector 1 If you’ll answer a few questions about your sleep and bedding preferences, we’ll recommend the topper that fits you best. Where will the topper be used? Who will be sleeping on the topper ...

I would like the topper to be ... Depends on the day2-inch Memory Foam Mattress Topper and Waterproof Mattress Pad – Twin XL Feel good about what you’re sleeping on. This mattress topper and mattress pad combination gives superior waterproof protection plus unbeatable comfort for any Twin XL mattress. The soft, fiber-filled mattress pad is designed with a noiseless waterproof barrier to guarantee that liquids will not get through. The 2 inch mattress topper is designed with premium pressure-relieving memory foam made only in the USA, for quality you can count on. Durable, high quality sides and corners stretch-to-fit up to a 15-inch deep mattress to ensure the pad stays in place on your mattress time after time. 2 in 1 for the Twin XL mattress – Add comfort and support you want, and waterproof protection you need Soft fiber-filled mattress pad designed with noiseless waterproof barrier – fits up to 15-inch deep mattress, and washer and dryer safe 2 inch premium memory foam mattress topper proven to relieve pressure points for unbeatable comfort and support