Soft washing a typical house exterior usually takes most of a day, sometimes less for a small bungalow and sometimes longer for a large detached home with lots of render. Unlike pressure washing, much of the time is not spent spraying but waiting: the cleaning solution needs to sit on the surface long enough to kill algae, mould and lichen at the root before it is rinsed. Rushing that step is the main reason soft washes fail.
This guide explains the stages, what adds time and why the result keeps improving for days after the visit.
The stages of a soft wash
Preparing the area. Plants below the walls are wetted or covered, windows and doors are closed, and anything that could be splashed is moved away. This protects the garden and makes the rest of the job quicker.
Applying the solution. Cleaning solution is applied at low pressure across the walls, fascias or other surfaces being cleaned. Each area is worked systematically so nothing dries out too soon.
Dwell time. The solution is left to work. This is when the growth is actually killed, and it cannot be hurried without weakening the result.
Rinsing. The surface is rinsed down at low pressure, and surrounding areas are rinsed again to protect plants and paintwork.
What makes one house take longer
The total wall area, the number of storeys and how many different surfaces are included all add time. A house with render on every side, fascias and soffits and a conservatory takes far longer than one with a single rendered gable.
Heavy growth can need a second application. Access matters too: tight gaps between houses, conservatories and extensions below the walls, and dense planting all slow the work down.
Why weather matters
Soft washing needs reasonably dry, mild conditions. Rain can dilute and wash off the solution before it has done its job, and strong sun or wind can dry it too quickly. A careful team will choose the day with the weather in mind, and may move a booking rather than waste the visit.
The result keeps improving
Because a soft wash kills growth at the root rather than blasting it off, some staining continues to fade for days and even weeks after the visit as rain washes away the dead organisms. It is normal for the walls to look better a fortnight later than they did on the day, and the clean usually lasts much longer than a pressure wash on the same surface.
Combining soft washing with other work
Fascias and soffits are soft washed to remove cobwebs, dust, mould and debris, using products suited to the fascia or soffit. Render can be soft washed or steam cleaned. Having these done together, often alongside gutter clearing, saves a second visit.
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