We don’t always have the answers, but we have some people on speed dial who do — which is why we present to you our series FYI where we have experts explain if lip balm is actually bad , how often you should wash your hair and more. If you wear glasses , you know just how annoying smudges can be. In fact, it can be nearly impossible to focus on whatever you’re looking at. Plus, if you use the wrong products to clean eyewear, it can compromise their quality over time, which leads to more costs down the road. To keep your glasses clean without ruining them, it’s best to use cleaners that don’t have “alcohol, harsh chemicals, perfumes and scents,” says Sheena Taff, an optician and business owner at Optician About Town . “The smell is usually a great indicator, lens cleaner shouldn’t have an obvious odor to it.” For a step-by-step tutorial on the best way to clean glasses — and the best products to do it — I asked Taff and other eyewear experts for their guidance, which I share below. Selected.…