Planting Trays All Fall Over

I have a routine in late Winter.  I soak old planting trays in the laundry tub with a bit of bleach to drown/kill any insect eggs and rinse them thoroughly.  Then I fill them with newly-mixed potting soil I make/mix myself.  I fill the trays of plastic cell-packs with my mix.  And then stack them up for easy access.

Well  "Some Kitty" seems to have considered that a good way to jump up onto the old basement refrigerator...

AARGH!  

It sure took a while of sweeping, moving stuff around, more sweeping.  But everything is clean and the soil recovered in buckets.  I'd rather it hadn't happened, but the potting area is cleaner now that it has been for a few years.  

I made sure to leave the recovered trays stacked lower and make more stable.  Set me back a week (I didn't clean it all up in a single day).  But at least I am ready to move forward with planting seeds again...