Press cloth for interfacing?

Hey sewing ladies, I have a question about interfacing. I'm making a t-shirt quilt for my sis, have cut out all the squares, and am now ready to iron on interfacing to them.

The interfacing instructions refer to using a press cloth - what is that exactly?
Is that something I should go out and buy, or can I use something else at home (towel, dishtowel?)
thanks!

Lemon Drop

picked up a bottle of this stuff at Mollie Stones tonight and made lemon drops for me and Chris. It was pretty yummy, the mix was nice and tangy, almost a grapefruity flavour to it. It was definately convenient to just add the mix to vodka then shake over ice. Me likey!
http://nantucketoffshore.com/LemonDrop.asp