I tend to be ridiculously un-careful with my specs except with how I clean them, my current glasses are regular plastic with no coatings and they haven't scratched yet. I wash them under warm water with dish detergent and my fingers and them hit them with compressed air or a micro fiber cloth to dry. I wonder how you are cleaning yours as my current pair are over a year old and I can't find a single scratch.

Mine are also regular uncoated ADC plastic, and I wash them with warm water + dish detergent + microfiber cloth. I then rinse under a thin stream of running water, slow enough that it has laminar flow, and I angle the glasses so the water hits the lens close to parallel to the surface. The water sheets off the lens without splashing and leaves it visually flawless. I always rinse the microfiber cloth before use to remove any grit or abrasive dust, and I avoid touching the lenses with anything but the wet microfiber cloth.

I clean the same way, but dry with a lint free cotton cloth. My lenses have AR coating though