Knitted kitchen cloths

This is how I make my knitted dishcloths. I use 100% cotton wool and size 4 needles. I have exprimented with 50% cotton 50% bamboo but I find that after washing them they come out too stiff.

I use size 4 needles (the instructions say use size 3.5 but I didn't have any that size)
Cast on 25 stitches
K5, P5 for 5 rows
P5, K5 for 5 rows

Continue for 35 rows (7 lots of 5 rows)
Cast off loosly.