How much coverage are you talking? For smaller areas I’ve had success with caustic soda. Mixed with wallpaper paste will help it stick to vertical surfaces. Wrapping it in plastic will stop it evaporating. Scrape off and wash with plenty of water. A stiff brush can help too but wear gloves and eye protection. If they’re old London stock don’t go at them with a stiff wire brush as they’re very soft and you’ll ruin them.
Bartoline TX10 is a more expensive but non caustic alternative.
For larger areas (I did my front garden wall) I’ve had pretty good results with Peelaway. Process is the same as above - brush on, cover with plastic, leave 24 hrs and peel off. They do 2 different versions (1 and 7) one of which is for lead or polyurethane based finishes but I can’t remember which is which. They do tester packs though if you’re unsure what finish you have. It’s quite expensive stuff though.
Cheers for the tips! Imaging a blind person painting the cills and that kinda stuff, it’s just hideous edges everywhere so need to neaten it up before repainting again.
How much coverage are you talking? For smaller areas I’ve had success with caustic soda. Mixed with wallpaper paste will help it stick to vertical surfaces. Wrapping it in plastic will stop it evaporating. Scrape off and wash with plenty of water. A stiff brush can help too but wear gloves and eye protection. If they’re old London stock don’t go at them with a stiff wire brush as they’re very soft and you’ll ruin them.
Bartoline TX10 is a more expensive but non caustic alternative.
For larger areas (I did my front garden wall) I’ve had pretty good results with Peelaway. Process is the same as above - brush on, cover with plastic, leave 24 hrs and peel off. They do 2 different versions (1 and 7) one of which is for lead or polyurethane based finishes but I can’t remember which is which. They do tester packs though if you’re unsure what finish you have. It’s quite expensive stuff though.