How to clean mould off wood windowframe

purplestar133

We've not long moved into a house with a velux window in the loft, The window frame is wood and appears to be bare wood, not painted or varnished. On the rim along the window, where the blind clips in, there are mould stains. I don't think there's any 'furry' mould, it's just that the wood is stained. Likely from condensation.

I was thinking of just sanding the wood and then applying a clear varnish. Should I use some method of cleaning before sanding? If so, what should I use? I hear bleach would stain the wood?

Is yacht varnish ok? (Probably not the best place to ask that!)

LHW99

Don't use ordinary household bleach. There are wood bleaches, which large hardware shops should stock. Make sure you follow all the instructions.

Yacht varnish is probably not bes, it is very hard, and almost impossible to paint with anything else afterwards.

There are plenty of clear gloss or satin varnishes for decorative finishes. Choose one that can be used for both interior and exterior wood if you need it to be particularly hardwearing.