The practice of cleaning exterior surfaces with a high-pressure water sprayer during periods of precipitation presents several considerations. The effectiveness of the cleaning process and the safety of the operator can be affected by concurrent rainfall. For example, achieving optimal results may be hindered if the water from rainfall dilutes the cleaning solution being used, or if it obscures the view of the area being cleaned.
Undertaking this type of cleaning while it is raining can potentially offer some advantages. The rain can assist in pre-soaking the surface, potentially loosening dirt and grime before the high-pressure cleaning begins. Further, the rain can aid in rinsing away dislodged debris, reducing the likelihood of re-deposition on the cleaned surface. Historically, such practices were often a necessity due to scheduling constraints or the urgency of the cleaning task.
