Working with eggs (specifically egg whites) when creating delicate buttercreams or meringues can be temperamental. Any grease or butter residue from past mixing can stick to your bowls even if they have been washed since. Using lemon or lime juice to cleanse them and then wiping with a clean towel gets rid of this grease! Also, always use metal or glass bowls when working with egg whites as plastic holds onto butter.

“Wipe down your bowls with lemon or lime juice if you’re going to be working with eggs (eg, for meringues etc) as any grease residue with ruin your work. Also, only use metal or glass bowls as these don’t hold grease!”