Original Features, Gentle Hands: A Protective Clean for Period London Flats

Period London flats have a way of making ordinary cleaning feel like a negotiation. That deep cornice has probably survived two world wars and several decades of cigarette smoke. The hallway tiles have taken more footfall than you have had hot dinners. The sash cords are older than the mortgage. None of it needs a hero with a spray bottle; it needs someone who knows when to use water, when to use a brush, and when to walk away and call a professional.

This is not a guide to making a Victorian conversion look brand new. It is a guide to keeping it looking cared for — original features intact, finishes intact, and no Saturday morning regrets.

First rule: identify before you clean

Before any liquid goes anywhere, work out what you are actually touching. Is the cornice painted plaster or bare, crumbly lime? Are the hallway tiles glazed or encaustic? Is the fireplace cast iron with original blacklead, or has it been painted over? Is the window frame original timber or a later replacement?

Test in a hidden spot if you are unsure — behind a radiator, under a sill, in a corner nobody photographs. Use the mildest thing that works, then stop. In period properties, 'stronger' rarely means 'cleaner'. It usually means 'newer looking in one patch and permanently different from everything around it'.

Work top to bottom, dry before wet

Dust falls. That is the whole logic behind cleaning ceilings and cornices first, then picture rails, skirting boards and floors. It also stops you smearing dust into damp surfaces lower down.

Start with dry methods: a soft brush, a microfibre cloth, a vacuum with a brush attachment and a delicate touch. For deep cornices and ceiling roses, a soft paintbrush or a fluffy duster reaches into the mouldings without scrubbing the profile. If the plaster is sound and painted, a lightly damp cloth can lift grime from the flat faces, but keep water away from cracks, stains and any area that feels soft or hollow.

Never use a stiff brush, a steam cleaner or a strong sugar-soap solution on ornate plaster. Never bleach a cornice to 'brighten it up'. If the plaster is crumbly, stained from a leak, or coming away from the ceiling, stop. That is a plastering job, not a cleaning job.

Sash windows: treat the cords like they are made of thread

Original sash windows are one of the great joys of London period flats and one of the easiest things to damage in a hurry. The cords are the weak point. They fray, dry out and snap, and replacing them is a window carpenter's job — not something you want to discover on a cold November evening.

Dust the frame and sill with a soft brush or vacuum brush. Clean glass with a normal glass cleaner sprayed onto a cloth, not directly onto the frame, so liquid does not run into the rebates. Wipe the painted timber with a barely damp cloth and dry it immediately. Do not soak the frame, do not pour water into the sash channels, and do not tug the window up and down repeatedly while cleaning. If a cord looks fuzzy, stretched or has a knot in it, leave the window alone and get it looked at.

Avoid oiling or greasing cords unless you know exactly what the window needs. Some lubricants attract grit and shorten the life of the cord. A professional window restorer will know what is appropriate for the age and condition of the sash.

Encaustic hallway tiles: damp mop, not wet mop

Encaustic tiles are not glazed like modern ceramics. They are coloured through the body of the tile, which is why they look so good after a century — and why they stain, etch and dull if you attack them with the wrong product.

Sweep or vacuum first. Then use a pH-neutral cleaner and a well-wrung mop. The floor should be damp for a moment, not wet. Acidic descalers, bleach, steam cleaners and abrasive powders are all out. They can strip the surface, draw out colour and leave a chalky patch that no amount of buffing will fix.

If the tiles are covered in years of wax, polish or grime, get advice before you strip anything. A specialist can test a small area and recommend a route that preserves the pattern. Once clean, keep foot traffic sensible and use doormats — London pavements are not kind to period flooring.

Cast-iron fireplaces: less product, more patience

Cast-iron fireplaces collect dust in every rib and recess. Vacuum with a brush attachment, then use a soft brush to reach into the details. If the surface is painted, wipe with a barely damp cloth and dry it. If it is bare cast iron with original blacklead, avoid water where possible and do not use abrasive pads or harsh degreasers.

Rust blooms and flaking paint are signs to pause. Sanding old paint in a period flat can release lead dust if the layers are old enough, so leave paint removal to a specialist. A professional clean and re-blacklead can make a fireplace look properly cared for without erasing its age.

The order that keeps you out of trouble

Work in this sequence: dry dust the ceiling and cornice; dust picture rails, radiators and skirting; clean windows and frames with minimal moisture; wipe painted woodwork; clean tiles and fireplaces; then vacuum and mop floors last. Keep a dry cloth handy for anything that looks too wet, and change water often.

When to call in a professional

Call a professional cleaner or restorer if plaster is loose or crumbly, if a sash cord is frayed, if tiles are stained or losing their surface, if cast iron is rusting or flaking, or if you do not know what a surface is finished with. The same applies to heavy nicotine film, old wax build-up and anything that needs standing on a ladder near a high ceiling.

A good period flat does not need to look sterilised. It needs to look looked after. Gentle methods, dry tools and a bit of restraint will do more for the character of a London conversion than any miracle spray — and they will keep the next hundred years of history exactly where it belongs.