Welcome!
Just wanted to second (or fifth, whatever) the comments on the metal racks. I have coated metal racks that I placed rug canvas on. I think that's what it was called, honestly I just wandered around the yarn sections at Hobby Lobby until I found something that looked like it would work. It came in a large sheet, so I had to cut it to fit the shelves, but I covered three of the four shelves (the top shelf is used for misc storage) and still have enough to do 4 more shelves if I ever expand. I had been using a stainless steel shelving which is "supposed" to not react, but I lost almost 30 bars to DOS. I have also used the commercial stacking dishwashing racks and bakers trays. If you don't have too many soaps, you can set them on any clean flat surface and then flip them every few days/week.
