I cannot speak to the issue of grey cats, no. No experience, sorry. But I can speak to the issue of black cats. My black cat would rush to a linen cart for sure. When I lay clean linens on a sofa, who jumps right on top of them? Tommy. When I bring a hamper full of clean clothes from the laundry room, what does Tommy think of the purpose of my washing the clothes? Correct - so that he would jump on top of them and make a nice cozy bed for himself. Why do you think linen carts exist IN REALITY? So that cats can run under them or climb on top of them. That it the TRUE reason linen carts exist, and anybody who thinks otherwise is delusional .