Here's an easy solution for keeping your USB C devices free from dust and other unsavory particulates. These squishy Silicone USB C Dust Cover Inserts slip neatly into any computer or device with a USB C socket, from the Adafruit Feather STM32F405 Express to the Raspberry Pi 4. 

Comes in a pack of ten, so you're set even if you have a computer with a lot of ports, or if you lose some.