How can I freshen a foam memory pad mattress topper?

Lightly sprinkle some borax or baking powder on your memory foam. Let it sit for at least 30 to 45 minutes. This will give your memory foam a bright and fresh smell.

If you are able to at this time of year you could take it outside and use a bucket of soapy water and a hose to get it really clean and then let it dry in the sun.

https://www.thespruce.com/wash-foam-mattress-pad-yoga-mat-2146355

Please let us know what helped.

Try sprinkling with baking soda and let sit. Then vacuum.

I hang mine outside in the spring. While hanging I give it a big shot of homemade Frabeze.

The baking soda sprinkled on it will remove smells. Let a dusting of bs set for at least 1/2 hour and then vacuum up with the brush attachment. If the weather is decent and you have a place to take it outside to air out, that would put some freshness into it.

Sprinkle baking soda on your foam and vacuum it up after an hour. Then hit it with Febreeze. You could also use linen spray for a fresh scent. Good luck.

Let us know if that works!