A conservatory is one of the most enjoyable spaces in a home — flooded with natural light and offering a seamless connection to the garden. But all that glass, exposed roofing, and outdoor proximity means it can accumulate dirt, algae, and grime faster than almost any other room in the house.
Whether yours is a lean-to, Victorian, or Edwardian style, this step-by-step guide covers everything you need to clean your conservatory thoroughly and safely.
What You’ll Need
Before you start, gather the following:
- Soft-bristle brush or long-handled broom
- Telescopic window cleaning pole with squeegee and washer head
- Bucket and warm water
- Mild washing-up liquid or specialist conservatory cleaner
- White vinegar (for algae and mould)
- Microfibre cloths
- Soft sponge or non-abrasive scrubbing pad
- Garden hose or pressure washer (low setting)
- Ladder (if needed for roof access — use with caution)
- Gutter scoop or trowel
Safety note: Never walk directly on a conservatory roof. Polycarbonate and glass panels are not designed to bear weight. Use a ladder positioned against the frame, or hire a professional for roof cleaning.
Step 1: Clear the Gutters
Start at the top and work your way down. Blocked gutters are one of the main causes of damp, leaks, and algae growth on conservatory roofs and frames.
- Remove leaves, moss, and debris from gutters using a scoop or gloved hands
- Flush gutters with a hose to check they’re draining freely
- Check downpipes aren’t blocked — pour water in from the top and watch it flow out at the bottom
Step 2: Clean the Roof Panels
Conservatory roofs — whether polycarbonate or glass — attract algae, lichen, and general grime, particularly in shaded or north-facing positions.
Polycarbonate Roof Panels
- Use a soft brush or mop head on a telescopic pole — never abrasive pads, which will scratch the surface
- Mix warm water with a small amount of washing-up liquid and apply with the soft head
- Rinse thoroughly with clean water
- For algae or green staining, apply a diluted white vinegar solution (1 part vinegar to 3 parts water), leave for 5–10 minutes, then rinse off
Glass Roof Panels
- Apply soapy water with a soft washer head on a telescopic pole
- Use the squeegee to remove water in overlapping strokes
- Finish with a clean microfibre cloth to remove streaks
- For stubborn algae or mould, use a specialist glass cleaner or diluted vinegar solution
Step 3: Clean the Frames
Most conservatory frames are uPVC, aluminium, or timber. Each requires a slightly different approach.
uPVC Frames
- Wipe down with warm soapy water and a soft cloth
- For yellowing or stubborn staining, use a specialist uPVC cleaner — avoid bleach, which can cause discolouration over time
- Pay attention to the joints and corners where dirt accumulates
- Rinse with clean water and dry with a microfibre cloth
Aluminium Frames
- Wipe with warm soapy water and a soft cloth
- Avoid abrasive cleaners that can scratch the powder-coated finish
- Dry thoroughly to prevent water spots
Timber Frames
- Clean with a mild wood cleaner and soft brush
- Check for signs of rot, peeling paint, or cracked sealant
- Re-paint or re-stain as needed to protect the wood from moisture
Step 4: Clean the Glass Panels (Walls)
The vertical glass panels are usually the most visible part of your conservatory, so getting them streak-free makes a big difference.
- Apply warm soapy water with a soft washer head
- Work from top to bottom in overlapping strokes
- Use a squeegee to remove the water, wiping the blade after each stroke
- Buff with a dry microfibre cloth for a streak-free finish
- For self-cleaning glass, simply rinse with water — avoid soap, which can leave residue that reduces effectiveness
Step 5: Tackle Algae and Mould
Green algae and black mould are common on conservatories, particularly in wetter climates or shaded positions.
- Algae: Apply a diluted white vinegar solution or a specialist algae remover. Leave for 10–15 minutes, then scrub gently and rinse
- Mould on frames or sealant: Use a mould remover spray, leave as directed, then wipe clean. Ensure the area is well ventilated
- Lichen: This is tougher to remove and may require a specialist lichen treatment left on for several hours before rinsing
If mould growth is extensive or keeps returning, it may indicate a ventilation or drainage issue that needs addressing.
Step 6: Clean the Floor
Conservatory floors vary widely — tiled, laminate, stone, or carpet. Tailor your approach accordingly.
- Tiles and stone: Sweep first, then mop with a suitable floor cleaner. Use a grout brush on discoloured grout lines
- Laminate: Sweep or vacuum, then damp-mop with a laminate-safe cleaner — avoid excess water
- Carpet: Vacuum thoroughly, then treat any stains. If the carpet has absorbed moisture or smells damp, a professional carpet clean will restore it properly
Step 7: Clean the Interior
Don’t forget the inside of the glass, frames, and any furniture.
- Wipe down interior glass with a glass cleaner and microfibre cloth
- Clean interior frames with warm soapy water
- Dust blinds, windowsills, and any shelving
- Wipe down furniture and cushions
- Check the door threshold and seals for dirt build-up
How Often Should You Clean Your Conservatory?
- Gutters: At least twice a year (spring and autumn)
- Roof and exterior glass: Every 3–6 months, or more frequently if surrounded by trees
- Frames and interior: Monthly wipe-down, with a thorough clean every season
When to Call in the Professionals
Some conservatory cleaning jobs are best left to the experts — particularly roof cleaning, which involves working at height and handling specialist cleaning products.
If your conservatory hasn’t been cleaned in a while, or if algae and mould have taken hold, a specialist cleaning service can restore it to its best without risking damage to the panels or frames. For a regular interior clean as part of a wider home maintenance routine, a professional home cleaning service can keep things ticking over between your deeper seasonal cleans.
A clean conservatory is a joy to spend time in. With the right tools and a regular routine, keeping yours in great condition doesn’t have to be a chore.
