Do, or don't? On my MX-5 I did hand washes due to the top, but now I have a solid roof car, so what is the verdict on using these? Touchless only? or are the ones with brushes okay to use? I don't wanna be an idiot, and I can certainly hand wash my car just curious as it would be easier to take it through a wash. I know since I've joined I've asked a ton of questions, but I figure the more I know the better off. Not only that, others may have the question and are just not asking it 

If they wash those beauties with it should be ok for my Si as well.

I just did a quick search for that town