Mysterious blue cloth

are these one use?

Those are called shop towels, and for kitchen applications, I would say they have two or three, save for messy plate or pans. They're the best for soaking up large amounts of grease

but like, i dont understand the purpose of them
are they for washing up?
why not use a sponge or some shit, it'll give you a lot more uses

yes

i use shop towels in the garage where they belong

...

>mysterious blue cloth
I actually use this brand in my kitchen, they absorb liquids much better than OP's brand.
Also you can let them dry and reuse them if you just clean water on your coutertop

not shop towels they look like j-cloths

unrelated question, but how do you guys clean a jagged knife without cutting up the sponge/cloth you're using to clean it

very carefully

that doesn't help though
because sometimes you have to clean something right off the jagged part, and if you're too deliberate it doesn't go away, if you use enough force to clean it you fuck up your sponge
i'm so perplexed by this, it just kills my sponges