If you have a concrete patio, it has probably gotten dirty over time. You can clean it so that you can get it looking as good as possible. You can rinse it off using a hose to help keep some of the superficial dirt off the patio, but that won't do a good, deep cleaning. There are things that you can do to clean up your patio on your own.
Clear and Sweep
The first thing that you should do is clear off your patio so that you have a completely blank surface to work with. Trying to clean around patio furniture and grills is just going to make your job harder, and it's going to leave you with a spotty patio. After you clear it off, you should get a broom and sweep it off. Sweeping will help get rid of all the debris on the patio. It can also help to loosen up surface dirt that is caked onto your patio. Getting that kind of stuff off your patio will make your job easier because you aren't going to end up with mud while you're trying to clean.
After you have swept the patio off, you should grab your hose and give your patio a nice rinse. You aren't really trying to clean anything with this particular rinse; you just want to rinse off anything that you brought up when you were sweeping your patio. The more you get rid of now, the better it will be when you get the power washer out.
This is the time when you pull out the concrete cleaning solution and the pressure washer. Most pressure washers have a container where you can put the cleaning solution so that when the water runs through the washer, it will go into the container first. That will let the soap get to the concrete under pressure, which will let it get into the dirt and stains and get everything clean. When you are cleaning, clean your concrete one section at a time. That will let you cover the whole patio without missing a spot. When you have cleaned the whole thing, it's time for you to rinse it again. Use the pressure washer this time so that you can be sure that you are getting everything rinsed off and off the patio. When your patio is dry, you may want to consider sealing it, which will make it easier to clean your patio the next time.
If you just want to have a clean patio but you don't want to do the work to get it clean, you can contact a concrete cleaning service to see if they will clean your patio for you.