Henry come on! 150 bucks an hr?! That's more than what some doctors make! Lol seriously, I gave a customer I did roof repair work an estimate on his molding deck approx. 200sq ft for 300.00 he said the last guy he used charged him 200.00.. I reasoned the point that you had mentioned above and that power washing alone is not going to help prolong his deck. So with that ejabationing him and all, I said I'll charge 200 plus material for the powerwash/deckcleaner.. and I said if you want a sealant it is an additional 150 bucks. I think it was a fair bid.