Unfortunately, none of our products are really meant for that purpose.

Your best bet would be to first try clay barring the area, if that doesn't work I would try some acetone.

We don't have our own clay bar in development at the moment, but we've had a few people asking for it so this is definitely on our to-do list! 
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Trying to get the rest of the product line released and then hopefully we can get something put together. It would be great if we can get something out there.

Having said that, I would really hate to point you to something that you didn't like, but any of the big name brands should be sufficient.

I did a quick search and found this one: https://www.amazon.com/dp/B01MSIDTGU

You do not need to purchase clay lube. The best and cheapest method to do this would be to use regular dish soap instead of your car wash soap (i like Dawn, but most others would work also).

1) Simply wash your vehicle with this water and dish soap mixture.
2) When you're done and while your vehicle is still wet, empty your bucket and refill it with clean dish soap and water.
3) Use this clean water/dish soap as your clay lube. Simply use your car wash mitt to squeeze this liquid wherever you're using your clay bar.
4) After done clay bar. Quick wash and thoroughly rinse your entire vehicle to get all of the soap and residue off.