Seems like I’ve read that detergent residue really shows up, through some military night vision scopes, also...
You guys are probably too young to remember that “ring around the collar” commercial...?
This made me sort of flash on a newer version of the commercial with an anthropomorphic doe - perhaps sipping a cup of coffee, wearing a house dress - gesturing out the window at a hunter who thinks he’s adequately hidden in tall grass, but visible to her extraordinary eyesight because of the residue left on his clothing from laundry detergent. “What a schmuck!” she exclaims with a chuckle.
Then another hunter - who was visible because of his eyeblinks in another clump of brush but otherwise not that noticeable - rises up while the doe is ridiculing hunters whose wives don’t launder their hunting togs properly, draws a bead, and shoots her. Then a brief ad for a non-residue laundry product rolls while the hunter strides confidently forward and drags his kill out onto the lawn of the anachronistic deer-house (there’s broken glass everywhere from the bullet going through the window), where he methodically cuts her human-style clothing away in preparation for butchering.
What...? That’s good advertising, right there.