This as-told-to essay is based on a conversation with Lucas Da Silva, a vertical site supervisor for the Leadenhall Building in London. It has been edited for length and clarity. The first time I went ...

I've tested hundreds of cleaning products over the course of my 10-year career as a product tester. I've reviewed it all: vacuums, mops, carpet cleaners, dusters, you name it. But you know what I've ...