I would wash it in the bathtub with a little detergent, rinse well and dry it out in the sun.
In our area JoAnne fabric has foam for sale, they have up to 5 inch thick foam. It can go on sale or use a coupon from the ad.
I hope you can get the smell out.
I have found foam tha can be cut to your sizes needed at Jo-Ann's fabrics..(and no I don't work at one..I've purchased one there) and then if it is too big and needs a little trimming..use electric knife to cut..works like a charm....hope this helps,deb
You could also try sprinkling the cushion with bicarbonate of soda (baking soda). Leave for half an hour and vacuum. I did this on a carpet where one of my cats did a Number Two and it worked beautifully; no smell and stains afterwards.
yes you can replace or use urine be gone it works great and neutralizes the odor.
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