How to Clean Outdoor Porcelain Paving Slabs

Porcelain's near-zero porosity means dirt sits on the surface instead of soaking in — so cleaning it is genuinely easy: sweep, wash with warm water and a pH-neutral cleaner, rinse. No sealing, no special regime. The mistakes worth avoiding are the products that leave films (wax cleaners), scratch (wire brushes) or attack the joints (strong acids).

What you need

• Soft broom or leaf blower for dry debris.
• Bucket, warm water and a pH-neutral tile/porcelain cleaner (a squirt of washing-up liquid works for routine washes — rinse it off well, as soap films hold dirt).
• Stiff nylon brush — never wire, which scratches and can leave rust specks.
• Optional: pressure washer with a fan nozzle; porcelain-safe algae/black-spot treatment for shaded areas.

Step 1: Sweep the surface dry

Sweep or blow off leaves, soil and debris while the paving is dry. Do this little and often through autumn — leaf tannins are the main source of surface staining on any patio, and on porcelain they rinse off easily if they don't sit for weeks.

Step 2: Wash with a pH-neutral cleaner

Mop or brush the surface with warm water and a pH-neutral cleaner, working in sections. Let it dwell for a few minutes on grimy areas, agitate with the nylon brush, and you'll lift general dirt, footwear marks and greasy films without touching the joints.

Step 3: Rinse thoroughly

Rinse each section with clean water before the dirty solution dries back on. On a warm day work in smaller sections — the wash-dries-before-rinse cycle is what causes streaky "cleaned but worse" patios.

Step 4: Jet wash seasonally if you like

Porcelain tolerates domestic pressure washers well: use a fan (not pencil/turbo) nozzle, keep the lance about 30cm off the surface, and work at a shallow angle away from the joints. The slab won't care; jointing compound can, so don't hover over the joints — and if you do blast any jointing out, top it up (see the grouting guide).

Step 5: Spot-treat as things appear

• Algae (green film) — common on shaded, north-facing paving: apply a porcelain-safe algaecide or patio cleaner, dwell per the label, brush and rinse.
• Moss — grows in joints and shade: lift the growth mechanically first, then treat the area so it doesn't return.
• Black spot (lichen) — the stubborn one; it anchors into microscopic surface texture. On porcelain it gets far less grip than on natural stone, but established spots still need a dedicated black-spot remover and patience rather than raw pressure.
• Mortar or cement marks — a different job entirely: see removing dried cement from paving.

After winter

A spring wash (steps 1–3) plus a joint inspection is all porcelain needs. Check for any jointing cracked by frost, re-fill where needed, and treat any algae that took hold over the wet months before it walks indoors.

What to avoid on porcelain

• Wax-based or "shine restoring" cleaners — they leave a film porcelain doesn't need, which then holds dirt and can turn slippery.
• Wire brushes and steel wool — scratches and rust marks.
• Strong acids (brick acid) as routine cleaners — the slab may cope, but joints and nearby natural stone won't.
• Sealers "for good measure" — porcelain doesn't need sealing; save the money.

This low-maintenance profile is most of the case for porcelain over natural stone — the comparison guide covers the rest, and the porcelain range shows what's available. Natural sandstone owners: the regime differs (sealing helps, acids are riskier) — treat this guide as porcelain-specific.

Frequently asked questions