http://www.cleanitup.co.uk/smf/index.php?topic=169676.0
You don't have to look too far for clues ! If the customer is happy who cares whats said on here but when you post photos the you will be open to hole picking. I don't seal, point and rarely use bleachbut somehow manage to scratch a living. I can't say customers notice the odd lichen spot but as a professional cleaner you need to know how to should you be pulled.
Yeah I know but like I always say, everytime people put photos on here someone always picks faults. I know what you mean in a few areas there is little marks but think about 10+ years of dirty! For £100 that was a bargain
Now don't take this the wrong way, photos look good, and the general clean is good, but there are still lichen spots, which is what if you get rid of them will make you stand out from the rest of the crowd. Very easy to remove with hypo. Re the sealing, you cannot seal the paving with bits of pointing missing easy as that.
Don't mean to be hard on you but this sort of clean is a normal day for some on here and removing lichen should just be part of the clean, not an added extra as some people seem to think it is. Learn the trade, do it right, you'll get there.