Did all mine yesterday. Two weak, one had a bit of chalk but the rest were strong and healthy. In most the brood nest was in top box only, but did extend over both boxes in a few.
The top boxes were the messiest, but bottoms needed a clean up too. A beautiful day, no wind, bright sun and 16 degrees.
I just settled for the spring clean and will unite and equalise in a week or so, when they really get going. Queen had recently had a brood break in all of them. Quite a bit of sealed crystallised stores, which got a scrape and a spray. They were bringing in loads of pollen, but little stored in the frames. Could have done with some patties this year.
Decided I do not like the white queen marking pens, it had worn off most of them - I only use red, yellow and white and note down queen age.