Plexus is good, but Novus plastic polish is better in my experience.
This I stumbled onto this product 30+ years ago at a commercial acrylic wholesale place and I haven't found anything else that comes close.
Simply rinse off the cart with a hose, spray on the Novus and lightly buff it off with a clean microfiber cloth. It contains ingredients that actually nourish the plastic and replace oils in it. You probably won't need it but you can also try the fine scratch remover which also works fantastic.
I actually use it so much I just buy it in the 64 oz jug.
NOVUS 7020 | Plastic Clean & Shine #1 | 8 Ounce Bottle
https://a.co/d/g6S5iCS