Using these addi Turbo circular needles is a breeze. Just thread your yarn through the needle and start knitting as you normally would. The smooth nickel coating helps the yarn move easily, so you can work on your projects faster. When it comes to the non - standard sizing, make sure to double - check the actual size as mentioned in the product details. For cleaning, use a soft, dry cloth to wipe the needles. Avoid using harsh chemicals as they may damage the nickel coating. Store the needles in a dry place, away from sharp objects that could scratch them. If you're using the US 36 or US 50 needles, be gentle with the plastic tips as they can break if mishandled.