Window mould.

[Nicksey]

I have just given the Jazz its first 2026 full top to bottom wash and wax (I have washed it before, but only cursory cleans as the weather was always unreliable).

After the recent sand rain, it was always going to be a challenge, and I found dirt in every single nook and cranny.. to be expected.

However, the most annoying thing was that every side window, along the rubber seal that lies just under the door/glass recess there was a build up of green moss like mould. It took an age to carefully remove it using a cocktail stick.

I keep the car on the drive, it isn't surrounded by lots of shrubs/fauna/flora and I only use Autoglym products and no jet wash.
Only once before on a single Renault Captur window have I had anything similar, and nowhere near this level. Maybe the rubber is of some concoction that promotes a good environment for growth?

Anyone else noticed this?

[RuthieB]

Hi Nicksey,
I have the same on our 21 plate EX. I occasionally use HG mould killer ( meant for mildew in bathrooms or other household condensation areas)
I squirt very carefully and sparingly along the rubber seals and work at it with an old toothbrush then hose down thoroughly…..seems to keep it clear for about a year or so.
WARNING this is a peroxide based liquid so you have to be very careful not to get it on to your clothes,hands or other areas!

[bill888]

fwiw, my previous Jazz suffered with this problem for many many years.  Last autumn year, I tried diluted 'Wet & Forget' for first time on the window seals and on the 'degraded/porous' hard black plastic rim of the wing mirror glass.   I just use a thin art brush to apply the solution.  Green algae did not return up to when I sold the car a few months later.

My current new car had started to develop same issue on window seals.  Brushed on Wet & Forget.  Not yet seen the green stuff return after a few weeks.

I originally bought 'Wet & Forget' to deal with an algae issue as it seemed to be the only product I could find that was safe to use on acrylic canvas awning which is used 365 days a year.  I sprayed it onto the awning 12 months ago when it was green tinted.  I've not had to reapply it 12 months later and it has not discoloured the canvas.

Manufacturer claims 'Wet & Forget' continues to work for months after application fwiw.

[Lord Voltermore]

I think the problem may be because the side window slide between an inner and outer blade  which has a sort of velvet/ velour   finish rather than smooth rubber . I assume  this is less likely to smear and less vulnerable to damage from  gritty or icy windows.     But more likely to host algae/mould growth.

I had similar algae  on my Yaris and  Corsa  which also had slightly  'furry' window seals.   

[Kremmen]

If you use something like these spray detailing waxes that can be sprayed anywhere, would they help put a layer that would protect against mould

My old routine, after I'd washed n waxed, was to dry off then go all over with a detailing spray wax

Originally I used Mantis, that was brilliant and had carranuba wax, but when that was discontinued I switched to Meguiars

[Nicksey]

If you use something like these spray detailing waxes that can be sprayed anywhere, would they help put a layer that would protect against mould

My old routine, after I'd washed n waxed, was to dry off then go all over with a detailing spray wax

Originally I used Mantis, that was brilliant and had carranuba wax, but when that was discontinued I switched to Meguiars

I do use the Meguiars as a finisher, but also the Autoglym Aqua wax too. I think I am going to use what others have suggested though, and apply a 'bathroom' type mould cleaner with a cotton bud along the seal rubber. I will see how this goes during the warmer spell, and report back in due course.