There is zero science behind cloth and homemade masks, the majority of what non-medical professionals are wearing, reducing infection of the wearer. Zero. You can't even put a number on it. Is it 50%? Is it 75%? There is no science supporting cloth masks. Here is some information debunking cloth masks however:
New study questions the effectiveness of masks against SARS-CoV-2
I apologize if this sounds harsh, but people need to stop spreading misinformation. The comment "It's not 100% effective, but they absolutely do help" is no different than me saying "The lockdown and economic collapse wasn't 100% effective, but it absolutely did help". Again, BS. Meanwhile, how many unemployed or small business owners are SOL, watching their lives get blown up?
My position is that a cloth mask is ineffective as PPE, but may help reduce the spread if I am an asymptomatic carrier. My position on carrying a gun or wearing a seatbelt or a condom have nothing to do with this and in fact show a distinct lack of comprehension as statistical studies have shown that all of those things mention have a very high probability of working to the benefit of the user. Masks, not so much.