To drain or not to drain?

[WindyCity]

Yes a drain is a must in my opinion, plus you cannot add it later. even if it drains to daylight that is good

[indiana lineman]

Not sure about your weather there, but is there a plan for the drain water freezing in the pipes?

I'm all in favor of a floor drain. Just seems like a give and take is to be thought of before moving ahead.

[Birdhunter]

I live in northern Minnesota and I have a floor drain in my detached garage. I do keep it heated at about 42 degrees most of the time because there is a bathroom in it and I love it. I wash my vehicles in all winter and it's great. I would suggest putting in the long narrow style drains on both sides of your wash area.

[CarolinasFinestDetailing]

^ Love his idea about drain style. Yes, put drain in. Not just for washing during winter, but rainy days and when you need to give the floor a good cleaning. Before you move anything in, seal or epoxy the slab too.