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Fungal spot on Borg ed89 lens


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I haven't been using my Borg refractor for a while, and it's always been kept in a metal protected case with foam inside and plenty of silica gel. Yesterday I was terrified to discover a fungal spot at the back of the objective lens! Could anyone recommend a good specialist in London or Kent area who could clean it off? I read some tips on lens fungus removal, yet I'm a bit worried not to ruin the lens if I try and do it myself, apart from that I have no idea how to dismantle the objective. It is really weird, as I also checked all my lenses/cameras/binocular which I keep in the same room, and yet none of those seems to be affected?
Any help on this would be greatly appreciated!

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Expose it to ultra-violet light.

I had an old Vixen refractor years ago that had fungal growth between the doublet. I gave the scope a suntan by placing it in front of my sisters face tanning light overnight. Stopped the fungus from further growth but dead fungus residue remained.

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5 hours ago, Franklin said:

Expose it to ultra-violet light.

I had an old Vixen refractor years ago that had fungal growth between the doublet. I gave the scope a suntan by placing it in front of my sisters face tanning light overnight. Stopped the fungus from further growth but dead fungus residue remained.

Specifically a UVC bulb, lower energy UV will not sterilise the surface. 

Edited by Adam J
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7 minutes ago, Franklin said:

Yes I read about that, I think it's the type they use in bug zappers.

Yes, I think that you are lucky really as with the modular design of the Borg you should be able to easily get to the rear lens surface with a isopropol on a pure cotton bud. 

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Thank you both for your suggestion! I think I'd rather clean it off, as I see that those uv bulbs have different connectors, and I'm not sure if I have compatible socket. I read somewhere that a mixture of peroxide and ammonia is commonly used to treat lens fungus but I'm worried not to ruin the coatings? I know isopropyl alcohol is safe but will it get rid of the fungus? 

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6 hours ago, stayks said:

Thank you both for your suggestion! I think I'd rather clean it off, as I see that those uv bulbs have different connectors, and I'm not sure if I have compatible socket. I read somewhere that a mixture of peroxide and ammonia is commonly used to treat lens fungus but I'm worried not to ruin the coatings? I know isopropyl alcohol is safe but will it get rid of the fungus? 

I would kill it with UV before removing it with the alcohol. 

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