I use a round dish because the tools I use flex to the sides and get 98% of everything in the dish.
I use the painters tool to get the majority out, I use a razor blade to scrape of the tool onto parchment. Surprisingly it comes right off.
I then use 1 or 2 blades to scrape towards myself while rotating the bowl, it gets everything. Takes me about 1 minute to scrape from bowl to parchment, by far the easiest method I've ever seen or used. Square dishes have corners and the angle between the wall and floor is too great. With the right sized round dish, the painters tool and the razor blades flex to conform to the surface, and get every last micron. Not to mention there is zero mess when done right. Painters tools were like $5 online, came with an assortment, but this shape works best for me.
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