how do you wash these? And by hand wash do you mean woolite?

The easiest way to wash these is in your washing machine on cold delicate and allow to air dry. If you hand wash, do so in your sink with some dish detergent, rinse out thoroughly, and again allow to air dry.

Will the 6” x 7” blue Koala be offered again soon? Loved the color vs. black color

Hi. We used to sell our Koala Kloth in turquoise, but when we changed factories to improve the quality of our cloths and have them come individually packaged in kraft paper pouches, we weren't able to continue to source the turquoise material to meet our demand, so we switched to black. Black is actually an improvement over turquoise as it shows dirt and dust particles easier, which tell you it's time to clean your cloth.

Not sure of the relevance of the question in regards to a lens cleaner. Can the questioner restate? (I'm interpreting GSM to refer to the weight of the fabric -- which is irrelevant for a 6x6 piece of cloth for cleaning lenses.)

ASIN	B06X9V866C
Best Sellers Rank	#11,212 in Health ( See Top 100 in Health ) #18 in Eyewear Cleaning Tissues & Cloths #1,743 in Cleaning Tools
Item model number	KOALA-KLOTH-HITECH-6X7-6
Manufacturer	Koala Lifestyle
Package Dimensions	10.4 x 9.2 x 3.4 cm; 30 g

Koala Lens Cleaning Cloth | Japanese Microfiber | Glasses Cleaning Cloths | Eyeglass Lens Cleaner | Eyeglasses, Camera, VR/AR Headset, and Screen Cleaner | Black & Green (Pack of 6)

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