I have recently bought a 2016 plate Audi A3 Cabriolet and I'm after suggestions on long term maintenance of the black fabric hood. I live in Devon which obviously is one of the wetter counties. What treatment is recommended to stop algae or lichen trying to get established on the hood. I'm seen several products advertised on Amazon. Any recommendations?

Welcome David and thanks for joining. 
I think the answer lies in how clean and good the hood is now.

Yes, there are proprietary products on the market, but the soft tops I’ve had have been treated to a good clean, then treated with Fabsil ( tent waterproofer) once a year. 
If you are going to DIY it then let us know and the basic, but important procedure can be outlined. 
Is the car kept outdoors with you? 
Regards,

Gareth. 

The car is often parked outside overnight. I was assuming that I would give the soft top a good clean and then regularly treat the fabric to keep it waterproof and prevent any deteriation.

 

Well that’s exactly what I am suggesting, and I’ve given you a product name that I’ve used to good effect. Anything else you need to be advised on David? 
It might be worth considering covering the hood with a tailored cover when not in use, but there are pros and cons with that. 

Any response for the forum David? 

I have bought my can of Fabsil on Amazon and just waiting for a dry afternoon so I can use it!

Are you going to clean it first David? 
I guess you aren’t going to start in the middle and work out to the sides.