Black mould beneath double glazing outer window seals

Primrose

I've noticed black mould forming beneath the outer seals on some of our double glazed windows. I assume this is where moisture has seeped in as a result of heavy rains & wind.
Is there any way of clearing it? The seals all seem to be fitting tightly against the glass so am reluctant to try & force them away from the glass but cannot see any other way of applying any kind of mould removing agent.

thebaldwindowfitter

can you only see this from the inside of the house ,have you got white gaskets rather than black?

Primrose

Yes, white gaskets rather than black and can only view it from indoors.

thebaldwindowfitter

theres no way apart from deglazing we never use it for that reason

Primrose

That's a pity because the white gaskets look so much nicer than the black ones and seem to let in more light. Also the black gaskets we previously had were rubber and used to leak black stains down all over the outside white window ledge. Is this one aspect of double glazing technology that has yet to be resolved?

msw10

It seem that you have condensation in between the two pane.
If the case you will need to replace the insulated glass. That's not a problem of gasket. it is the seal around the unit that is not good no more.
.

thebaldwindowfitter

msw10 wrote: »

It seem that you have condensation in between the two pane.
If the case you will need to replace the insulated glass. That's not a problem of gasket. it is the seal around the unit that is not good no more.
.

its mould on the gasket which holds the glass in place . Just a thought can you get a scraper blade between glass and gasket if so you could try getting a piece of copier paper down and sliding from one side to other

Primrose

I could try this on the affected downstairs windows but access to upstairs would be impossible without a ladder. When you say 'copier' paper, what exactly is this? Paper used in a photo copier or something else?

thebaldwindowfitter

yes its worth a try

joe134

Primrose wrote: »

I could try this on the affected downstairs windows but access to upstairs would be impossible without a ladder. When you say 'copier' paper, what exactly is this? Paper used in a photo copier or something else?

I use a toothbrush and bit of bleach in water,scrub side to side, and it gets behind the gasket,;depending how deep seal is, have used stanley blade, and photo paper,+bean/peas tin lid , hammered flat at edge, and bent, easier to use than blade. get it every year, and inside too, suffer with condensation problems.
Plenty ventilation, fans in bathroom/ cooker,got dehumidifier, too dear to run, just leave windows on the latch/locked at night.
Mould problems in my house, but bleach cures it, never done any harm to gaskets for last 18 years. Use it to clean grouting/ white silicon in shower cubicle.