What would be a good thick fabic i can rip up and use for cleaning?

Cotton. cotton jersey if you want something with stretch to it. It may fray some, so rip to size then wash it so you don't leave fuzzies behind.

Microfiber is a popular choice for cleaning clothes and cleans up easily.

T shirts

Terry Cloth --- like bathtowels --- get white -- so you can bleach the heck out of them...

I agree with both previous posts. I will just add that thrift stores are a great place to buy old Tahirts and towels!

I'm a fan of terrycloth. It's very absorbent.

Anything 100% cotton. A good t-shirt material will work. I would also get microfiber too. Both have their uses.

cotton toweling, old t-shirts, and worn flannel from PJ's or sheets are my favorite - and the larger thrift stores are great sources, there's no need to buy fabric new, unless you want them to be really fancy.

Old towels work very well. Cut them into squares and stitch together on one side, Don Aslet style. Thick enough to grasp and fold, 4 surfaces to turn to. Heavy enough to last and heavy duty to do most jobs.