I have a stash of odd cotton pieces - bargains bought at various shown, old clothes, cut offs and, my favourite, an old Masonic gown rescued from a skip. When printing I keep a selection of these fabrics handy - to wipe down screens and blocks and to wash them. The cleaning fabric is then left to dry and the patterns and strength of colour are a pleasant surprise.
Here are examples of three colourways after a block printing session:
The same technique can be used when cleaning up brushes and palettes after using acrylic paints. The fabric irons well even when paint-laden though I would hesitate using it in pieces which are intended for washing - but this is only because I haven't yet tested acrylics for colour fastness.
I'll post up pictures of the new fabrics shortly but, in the meantime, enjoy the cleaning!