Solved SD card not mounting on Mac or other card readers slots (Dry clean)

Chapi-Chapi Meccanica HD 0:02:56

Problem solved. Easy, safe - fast - simple and perfect, solution no wet clean or other danger tools. Can use this method to any card reader, mac os, usb card readers, Dslr Card slot, its easy and safe! Card reader slots collect dust and dirt on pin outs surface, after that dont work properly, its easy to clean with paper from A4 printer an Empty SD card adapter or SD card (i use empty because is more flexible inside slot).