Caravan and Canvas Annex - Help sought

Hi all,

I recently purchased a 22ft caravan onsite at the Hawkesbury River. The van is an older model Windsor (mid to late 80's at a guess) and comes with a canvas annex. The annex has mould on it and the annex roof seems to be leaking. The caravan also has a few leaks by the look of the stains around the roof. The water appears to be coming in around the roof vents and at a guess, some water seems to be coming in around in a few corners.

My questions are:
1. What should I use to clean the mould off the canvas annex
2. What product should I use to re-waterproof the annex
3. What products and steps are required to re-seal the van roof where the water is coming in around the roof vents and around the seems of the van

Any info is greatly appreciated.

Cheers
Jason