Hi 
,
I will soon be working on a new tool for iDO Tools - Improve Asana with our tools and automations to remove all archived projects from portfolios. If you are interested, make sure to watch that thread (you can comment or activate notifications).
Take care!
Edit: the tool is available! iDO Tools - Improve Asana with our tools and automations
Thanks for sharing @Bastien_Siebman!
Yass! 
This will be super useful!
The tool is available! iDO Tools - Improve Asana with our tools and automations
The free version allows you to clean one archived project at a time, but with a token you’ll be able to remove them all!
Do I remove them or are they filtered away so that I can make them appear again?
They are effectively removed from the portfolio.
Hi, I just archived a few completed projects and they are still visible in the list view of my portfolio. How do I get them out of it?
If you run my tool again and select the right portfolio they should be removed.
I don’t feel comfortable granting access to our asana but think your tools are helpful.