no clearcoat left, so how to protect for the Connecticut winter?

[Benzasaurus]

Hello!

My beautiful 300D looks pretty ugly now that all traces of clearcoat are gone on the roof, left rear door, trunk and rear fenders. The other doors and hood and front fenders are fine because they were replaced and repainted when the car was in a front end collision in the early 2000s. The shop did an excellent job and the paint has a mirror quality to it. But the two-tone effect has been getting worse every year and the car definitely needs new paint.

When you take a white rag and rub the areas without clearcoat, the cloth comes back green (the color is petrol green). I've had it garaged during the last few winters and felt ok with that as I save up for repairs and eventually a paint job, but I'm moving to a new apartment and won't have a garage this winter (or at least not for less than $900 for the year). I feel like I ought to save the money for the garage and put it toward a paint job, but how can I protect the car?

My mechanic recommended carnuba wax. I'm guessing I shouldn't clay the car first, right? Wouldn't that just rip paint off? And how much wax and how often do people think would be necessary to prevent damage under CT snow?

Any advice would be greatly appreciated! I would like to get the car a really good paint job eventually. I'm a grad student, so my income is small and saving up for that will take a while. I know many people don't approve of spending that kind of money on these cars but it's a labor of love. So how should I preserve it up to that point? Thanks in advance for any and all advice!