I have a Home Depot HDX pump spray setup with Simple Green mix, but I’ve kinda noticed that’s maybe a redneck thing, and I’m from Texas, ha. Put a half gallon for 50/50 water mix. Then pressure wash off. Had to do this on my CJ.
Dawn comes in spray bottles for the kitchen, and if the SG didn’t get it, I use that, it’s actually pretty amazing stuff. Spray heavy and leave it sit, repeat a few times, then pressure wash off.
If that doesn’t work, brake clean just because I don’t want to deal with the smell and cost out of the gate, ha.
Cheap brushes like kitchen type scrub brush don’t hurt during any of those efforts.
My CJ has had a lot of leak cleanup issues as you can tell , ha