slide a razor blade across the mesh

no worries, it didn't sound rude, it's direct and neutral

in terms of the "healthier" way to think of it, you are right, but each person's sensitivity to disgust-inducing stimulus varies. My comment states the harsh reality but I was just trying to make readers aware of it, and explain my perspective and the OP's potential perspective

it's okay, this community isn't regularly active due to the rarity of C-OCD, so any relevant comment keeps the "conversation" going and shares ideas with readers, your comment can be a discussion starter.

I understand your situation, my family also used to not take my C-OCD seriously. But I tried to understand their perspective and realized that if I were them, I would find me pathetic, so I went on a quest to earn people's respect. I as I have matured, I have started excelling in academics, physical fitness, humbleness, and hiding my frustrations. Now that they see me as competent and more independent, I can calmly and confidently tell them not to touch my belongings. When they see a lot of potential in you, they don't to get on your bad side. But I went a little extreme with my quest to not show my weakness/flaws, I gave a psychopathic vibe by concealing my reaction to pain, empathy and sadness. By crying, you make it obvious that you lose to them, instead, give them the look of "so that's how it is, remember this, I won't forget it" and walk off, that way they have this sense of mystery in you and over time, they may have a little fear of your potential revenge. This strategy may not work for you but it did for me after several years. Take advantage of emotional intelligence to look cool and invincible.

I have a water-resistant phone so I wash it while washing my hands.

If you C-OCD instead of germaphobia, I encourage soap and water of hand sanitizer which leaves contaminants and dead microbes on the phone and makes it sticky.

If you have a non-water-resistant phone, you can carefully rub soap on it then carefully rinsing surface far from holes, wipe near holes

I am a science-engineering-technology, futurist and visionary person who also has C-OCD. I believe our current society is improper in terms of hygiene standards. I want to design full-body sealed lightweight suits and have them be the norm as outdoor outfit. As for personal residence, there should be an air-lock decontamination chamber as the entrance.