If I understand correctly you want to save the resin stuck on the print and BP after the print is finished ? If so take a look at that :
Doesn’t work for the tallest prints but worth a look.
If your print doesn’t have any minima you should really not get any bits to filter, and I would pour the resin straight back into the tank. I don’t care about the resin stuck on the parts, but if I print a small part I still use the scraper to scrape off the resin stuck on the BP and pour is straight into the tank (from the BP, I scrape gently so at to not put aluminium bits into the tank).
In case you really want to pour into a container, then back into the tank, then use a black, opaque container with a somewhat airtight lid and you won’t have to store the container in a dark room 