For the shark fin antennas how risky is that? I see on their website they do not wash those. Is that a liability thing more than something that is likely to happen?

Hello Mr. Nguyen, we typically do not have problems with shark fins because we do not have a top rolling brush. However, a lot depends upon the age of it and how well secure it is to the vehicle. We have tape that you can request to help secure it if it makes you feel more comfortable. Hope this helps!

I had my Explorer washed (and have a shark fin antenna) with no issues.

It's up to you. Can you remove it easily?