Thought you'd be around Mike...........................
As you're probably well aware I'm well past my " sell by " but a while ago I worked as a two man team and got through a ton of work in a day.
Incidentally.......A past customer of mine was making an absolute fortune in his " Clean Bricks " business. His business was based entirely on washing down exterior walls with jet washers, of brick faced buildings to remove the white streaks from the cement / mortar / lime or whatever.
He used a product from a builders yard the name escapes me, but you'll probably know what I'm talking about. Don't know if the market is still there but if it is it's potentially a big earner.