If you clayed, polished, and used superwax last month I should think all you'd need would be a good wash prior to laying down the Americana. I think by claying again you would remove the majority of the superwax.
My plan is to wash, clay, polish (multiple stages), wash, machine superwax, wait a few days, wash, and finish up with Americana. From reading this forum I have learned that Machine Superwax is a sealant, not really a wax. I love the benefits of sealants, but they don't always look specacular....hence going with Americana as a last step product.