Indian sandstone · Pudsey LS28

Pudsey sandstone patio — safe deep clean

Green film, black spot and rust marks on riven Indian sandstone.

Indian sandstone in Pudsey gardens tends to darken from the north-facing edge inwards — that's algal, not staining, and it wants chemistry first.

We work Pudsey and the surrounding LS28 postcodes every week, so a Indian sandstone job here is a scheduled call, not a special trip.

What indian sandstone actually is

Defining traits in Pudsey

Where it goes wrong

Our process

Step 1

soft-wash biocide 24 hours before to lift the algal film at root

Step 2

hand-scrub or low-pressure rotary at reduced head pressure for the riven face

Step 3

targeted stain-specific treatment on rust freckling and lichen dots

Step 4

clean rinse and joint check with polymeric or kiln-dried refill as needed

Chemistry

Neutral-pH biocide first, then a lichen-specific oxidiser only on the black spots — never neat bleach onto Indian sandstone.

Timing

April to October gives the stone time to dry between passes; autumn cleans on shaded gardens should be paired with a residual biocide.

Typical use: rear garden patios, wrap-around terraces, steppingstone paths, pool surrounds.

Aftercare

Sweep leaves weekly through autumn, keep planters off the flags for a week after cleaning, and re-treat biocide every 12–18 months.

Is the biocide safe around pets and planting?: Yes at working dilution — we rinse thoroughly and ask for pets to stay indoors for an hour after treatment.
How long will a LS28 sandstone patio stay clean?: 12–24 months in a shaded Pudsey garden, longer if you sweep leaves off through autumn.
Do you seal Indian sandstone after cleaning?: Only on request — sealing changes the tone, so we walk Pudsey customers through the finish choice on site before booking anything in.
Can you get the black spot off completely?: We treat the lichen dots individually after the main clean; most fade heavily but on porous stone a few ghost marks are honest to expect.
Will pressure washing damage my Pudsey Indian sandstone?: It can if you go straight in with a rotary — we soft-wash first and only run reduced-pressure passes on the harder-standing joints.