Rinsing siding before painting

Why would you do that?
You'll be running the risk of the wall still being damp.
Wall needs to be totally dry.

how do I delete this post? never mind I figured it out

What kind of siding? Even if it's vinyl 30 minutes isn't enough. How long ago was it washed? What makes you think it needs rinsed? is it chalky?

To me there is nothing to gain by rinsing it at this point. If a good job was done with the initial cleaning, you are good to go. No method of cleaning gets everything off. You will always have spots that were missed, cobwebs that didn't get completely rinsed off, etc. Just keep a damp rag handy if you happen to come across missed areas.

I'm in the process of resodding, so there is a lot of dirt around the house. When it rains in the evenings, dirt gets splattered all over the walls. It is painted concrete block. I can't paint over all the dirt. My other options would be to knock it off with a brush, but I don't think that would get it off as well as a quick rinse.

Use a brush along with the rinsing. It will look like it's gone when wet, but will show up again when it's dry.

The bottom will be dry long before you get there if you start at the top unless of course if you're only doing that area.

I would say you are ok rinsing since it sounds like the lower part of your house and it should dry well before you get to painting it.