Before the scrubbing begins.
Winter can be hard on outdoor spaces. Don't let your balcony or deck send the wrong message to buyers who may find it difficult to tell the difference between a deck that needs repair and one that is just dirty. A little scrubbing with a brush and a bucket of hot soapy water (I used dishwasher detergent) can make a world of difference in a very short time.
After the scubbing ends!