If so, that would be happening on all similar ext walls with wallpaper.

And would be happening worse closer to the ceiling as it’s hotter up there.

If not, then I think there is more going on. Certainly it warrants closer investigation.

Yes, it does: you are going to struggle to really get rid of it in that case, because you can't remove the substrate on which it's growing, which is the plaster. It's porous to a degree, which will have allowed the hyphae of the mold to get down into the material.

I don't usually deal with that type of construction, I deal with drywall, but since the impacted materials can't be removed, I'd focus on killing it, sealing the wall, and not allowing it to return.

I recommend covering up any HVAC returns in this space while you remove the wallpaper and clean the walls. I suggest a quaternary ammonium to clean and kill, and then when the wall is completely dry, apply a coating that is designed to prevent mold growth. There are many brands, PPG makes a good one. Kilz makes a poor one.

Then do your best to ensure you keep your home within bounds for air quality to prevent condensation from occurring indoors. I don't live in a cold climate so I'd need to look up some additional details regarding that, but you can check ASHRAE for guidance.

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You most likely have a leak somewhere it depends on where the room is.
It could come from a leaky roof, pipe, condensation.
You should address where the water is coming from BEFORE you remodel the room or you will be throwing money away.

Thank you. Does it make a difference that it’s plaster then brickwork behind the wallpaper?

It's an exterior wall with wallpaper on it. That's acting as a vapor barrier. There may or may not be additional water intrusion, but there doesn't need to be for this to happen. Water is condensing between the wallpaper and the wall bc of poor insulation and temperature differentials from outside to inside, that's my assessment.

First things first - why are you attempting to do this? Is there an issue with the hinges or is this for aesthetic reasons?

You should not put wallpaper on exterior walls. There's mold growing behind it now. The drywall should be removed and replaced. Do not put vinyl wallpaper back on these walls or it will happen again.

You should call a specialist.

You need to figure out why the wall is getting wet. Is there extra rain hitting that wall outside? Is there a leak inside of the wall? you have to get rid of the moisture source, or the mold will keep coming back.

Do not treat mold lightly. It can be really bad on your health. There is a subreddit called toxicmoldexposure if you want to see what the symptoms are.

This, and maybe place some (chemical)dehumidifiers in the room.

keep furniture away from the wall. wipe the windows down every morning to remove condensation. if you can, open the windows for 15-30 minutes after you wiped them down. get a fan and aim it at the wall, just enough to keep the air moving.

Thanks for the advice!

Clamp a piece of wood on either side of it, this will prevent the outer layer from getting chewed up. Then use whatever metal-cutting drill bit you need.

So this is up my alley. I rehab bikes, boats and cars. If it were me, I'd hide a 12v charger and power the battery. Then fix it up and I'd ride the thing. If it's so old there's no battery I'd add one and a rectifier. I'd still display it inside but be able to take it out and ride it sometime too. Just drain the carb before taking it indoors. When it's hooked up to the charger you can turn the lights on like normal when it's on display.

You can wire a dimmer inline if you insist but I'd try it the way it is now and see if you when wanna dim it.

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A possibility. Check & empty drain hose. Disconnect both ends. flush it out. Reconnect and pour in strong water/bleach mix in hose. It may run get back in the water pump & help kill odor. Seems like a mold or rot problem somewhere. It could even be a sock or something somewhere i the agitator or it's "piping." Last thing I would do. fill washer with a bleach mix in the washer. Let it soak a day. Then add bleach. Move it to rinse setting. When it starts to pump out water shut it off and let it soak the water soak in the lower system. Good luck. They were good machines then.

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White vinegar will pull alot of the smells and its also a softener. Kept having mildew smell when i went to high efficiency washer. Swapped to using distilled white vinegar and no more problems.

Run a vinegar bio carbonate wash with no clothes. Google it

Use hot water. I had the same problem because I followed traditional advice to wash darks in cold water. Now, instead of light/dark, I separate my clothes into smelly (gym clothes, socks, underwear) and non-smelly (everything else). Smelly clothes get hot water. Solved my problem.

Try running a bleach wash (even without clothes in it). If there is anything living in there, that will usually kill it.

Also, you can try adding some Lysol Laundry Sanitizer to a regular wash, and see if that makes a difference.

https://www.amazon.com/Lysol-Laundry-Sanitizer-Additive-Crisp/dp/B01N6BP63M

It’s a metal door frame. A bitch to remove. My friend had this and found the metal frame was install after the flooring was put in.

I think this is it for sure.

Looks like the screws are on the other side. Close the door and see