Darn. You are in a pickle. If it's going to stay on until Friday the earliest, I would use something fairly weak since you're not stripping wax or polish dust. Find yourself a 28-32 oz bottle, clean. Pour 5-6 ounces of 50% IPA and the rest clean water, doesn't have to be fancy, RO water is fine. If you can't find that strength of IPA, the regular old 90% stuff at 2 ounces plus 30 oz of water will be fine. Assuming you can't find a bottle that size, you'll need to work on the math yourself to figure out how much you'll need. In addition, and because that stuff is going to be crusty to hell and back, you're going to need something strong to penetrate and strip it. This goes against my usual recommendations to everyone, but find yourself a bottle of Dawn Platinum. It needs to be the Platinum, you can get the regular stuff or the refill pump liquid (it's more viscous). Pour a tablespoon or two into the bottle and shake it up. Dishwashing liquid is the worst for car paint because it strips wax and oils, but Dawn Platinum has two types of enzymes; one eats at proteins and the other eats lipids. I've been unfortunately a few times in the past to get big rig exhaust soot all over my cars. This stuff sans alcohol will melt away that soot with a spray after presoaking. I've never found a car soap or spray act that fast and that good without needing reapplication.
This is what it'll look like. They're sold at just about every grocery store. You can use regular Dawn, too, but you'll need a lot because it doesn't contain the enzymes that this does.
For the actual scrubbing of the area, use your wash&wax combo liquid or whatever you use. Make it very potent and gently scrub the area with a clean sponge that you'll be throwing out later or use for your tires later on. I'd advise against using it on your paint again. You could if you managed to shave off the surfaces with a band saw. Go very slow, go gentle. You won't need a lot of pressure. We're trying to gently cleanse the area. Pretend you're uncovering an artifact and you want to be very gentle so as not to disturb it too much. Work from the top portion to the bottom. Making sure to keep the main blotch area wet with the solution to keep everything hydrated. You'll achieve this by working from top to bottom. Work the edges too until you get to the main middle area.
Here's the guide I've been using for my IPA solutions for years now.
https://www.autogeekonline.net/foru...ow-mix-ipa-inspecting-correction-results.html
I was buying my own IPA solution before this. Read it. Memorize it. Print it out. Cherish it. Once you're done and everything is gone. Give your car a nice normal wash using your regular sponge or mitt, and then rewax the car. I use less than the suggested amount for the IPA. You don't need much. Even a third strength will get the job done.