I was thinking about this in the shower: We both knoow that some skill is involved in both lines of work - mowing and washing. Can anyone run a ZTR, edger, hedgers, etc... Most likely not Can anyone use a $1200 + power washer and do delicate trim work 3 stories in the air? No. On the other hand, can anyone use a Home depot lawnboy ower and cut their grass? Yes, and it will probably look good with a few practices. Can anyone use a powerwasher to clean their driveway? of course, but it won't look as even as professional stuff. Obviously, a certain amount of skill is required to do more than simply mow grass or clean cement. Maybe they are trades, maybe they are occupations, who cares? As long as a viable service is being provided. Thats it.