Quick question on potting for 5-1-1
I'm getting 2 gallon blueberries I ordered online soon and would like them to go into a 5-1-1 mix in much larger containers. Do I wash all the old soil off when transplanting into the 5-1-1? I know this is an important step with the gritty mix but couldn't find info on this for the 5-1-1. Thanks!