I’m not opposed to trying pledge, I don’t want to polish over the dirt and discoloration. So you need something that’s going to deep clean it first. I have dried looking mud stains that are imbedded in the texture.
early on, I had some brown mud stains on the black trim on the hood that soap/water and a sponge wouldn't remove. Posted on here for help and Edward Neal mentioned the Lucas products, which are very inexpensive. They did the trick and the mud stains came out, looks like new.
The 2019 base seats were another story, and someone else (sorry, forgot who), told me to try Armor-all leather cleaning wipes, which did the trick on my seats.
Also, Ed's trick about spraying either the Lucas internal or wheel cleaner on the rear tub works like a charm. It seems to shed dirt and stays looking good, don't even wipe it when spraying, just put a healthy layer of spray on it and let it drip dry
Luckily the Lucas products are inexpensive on Amazon, I've just now ordered my 3rd set of them. https://www.amazon.com/gp/product/B00KYS2WYA/