This is my favorite car wash in all of Madison--and since I've been living here, they've only made it better and better! I'm on the far west side now, so I don't get to utilize suds it up car wash as often as I would like to, but I definitely stop every time that I'm on the east side! The basic wash is only five dollars and that includes a pre-spray by a car wash attendant and unlimited use of vacuum cleaners after your car wash. They also offer the ability to purchase passes for unlimited washes.
There are an abundance of vacuums with two different vacuum attachments to help get into the small cracks of your car. Note: This is a touch car wash and my only complaint is that it bends my front license plate forward (partially my fault for not having a better license plate holder). This is just a minor inconvenience to have a clean car without having to rush when vacuuming the inside.
I believe they even have dog treats if you bring your pup along...