Water is perhaps the worst enemy of paper money, and paper collectibles in general, so notes should never be washed or chemically treated, except perhaps in the most extenuating "museum restoration" circumstances. Water will destroy that wonderful natural sheen to the paper that experienced paper money collectors adore so much.
The only notes that I've washed & pressed in the last few years were some better asterisk notes that I carelessly spilled red wine (actually port) on. I reacted spontaneously and immersed them in a sink full of warm water but it was too late and some light red/brown stains remained. However, the notes still sold on eBay for what I considered to be reasonable prices, albeit at a loss to me! It's possible that some of the buyers decided to bleach them ....
Logged
" Buy the very best notes that you can afford and keep them for at least 10 years. " (Richard D. Lockwood, private communication, 1978).