I couldn't agree more.
I did a carpet the other day that was full of stains that the customer had smothered in Vanish, 1001 and God knows what and bleached it. Despite my best efforts it still looked c**p.
There is nothing more disheartening than leaving a job and being less than satisfied with the results.
Fortunately, the very next day I managed to get red wine out of a white carpet and left it looking immaculate because the customer had the presence of mind to simply leave a wet towel on it to try and blot it out. I wish all jobs were like that.