I didn't know that ozone generators were available to rent. That's a great idea; but I think I would do that after the bleach treatment to thoroughly kill the mildew first.
That, or replace the foam.
I got an Old Fat Boat
She's Slow But Handsome
Hard In The Chine, but Soft In The Transom
I Love Her Well, And She Must Love Me
But I think It's Only For My Money
. ..... Gordon Bok