<p>There's a reason those little lines on laundry detergent caps are vague and hard to read. It's so you pour more than you need to. And it apparently accounts for a huge part of the industry's profits.</p>
<p>Without perfect lighting conditions and sharp vision, the faint markings that blend in with the plastic cups have left many consumers squinting. And the related instructions are often vague. As a result, consumers are left to over-pour, and that's just what the flawed creators are counting on, say industry watchers.</p>