The weather is a big factor to the outcome of a chemical soft wash. If it is a hot summers day a chemical may not have enough time for its desired dwelling time before evaporating or decaying from UV exposure. With that we also need to bear in mind some chemicals should not be left to dry as they can cause streaking on the surface. Another weather condition we need to be mindful of is whether it is too cold. Like all chemical reactions, the warmer the temperature the faster the reaction and in our case the more effective a chemical is. When the temperatures drop to low single digits in the winter periods the majority of the chemicals we use will simply not work so these jobs will need to be rescheduled to a warmer day. And lastly an obvious weather conditions that we do unfortunately have a lot of here in the UK is rain. If it is forecasted to rain we have to take into consideration the strengths of the dilution rates we mix chemicals up too to either counter balance the fact light rain will dilute an applied chemical or in worse cases heavy rain will completely wash away the chemicals causing us to need to wait for the rain to pass or reschedule the job to a dry day.