I mean, isn't art supposed to be messy? Look at the masterworks of the greatest artists of all time--can you imagine what Monet's Nymphéas would look like if his mother had given him "mess-free" art supplies to play with? I bet Van Gogh made a huge mess before he was done with Starry Night.
I'm not an expert, but many of you are--what do you think? Are clean hands really worth it?