As part of trying to repair the damage caused by the Ex, I have been trying to get some deep black water stains out of some solid oak windowsills.
Removing all the coating - sanding back to bare wood - and serious loading of thick bleach seems to be doing the trick.
Some dripped onto some emulsion, and to my surprsie lifted it straight off the plaster!
No big deal since its all being filled sanded and redecked anyway, but I never knew bleach would strip emulsion.