I have bought them on Amazon and didn't catch the seller/manufacturer. Yes, they came from China and I don't clean them.
I did get a set once that had longer needle tips, about a quarter inch longer. I wish I could remember where I got those. The longer needle really comes in handy with some RTAs. Usually, I just put the lid on the vendor bottle and use them that way.
Nah, I don't wash until after use.