The full version of this saying is that a new broom sweeps clean, but the old one knows the corners. These are Amish handmade brooms, so whether they sweep clean or know the corners is not the point; the thing is that they are made by hand one at a time.
Natural corn fibers and straw are carefully selected, then bound and sewn with a handmade loom, yes a handmade loom.
In this day and age of robot vacuums and electric mops, a handmade broom might seem ridiculous to some people, like a manual can opener or a phone that hangs on the wall. But there’s a certain old world charm to them that I can appreciate.
They are also sold on eBay, Etsy and Amazon, but it’s not the same as buying one from a wise old craftsman with a long beard, black hat and a draft horse.