Were are you based mate?i`m in Liverpool and might be able to help you.Don`t go into driveway cleaning full time because it`s a summer thing,you`ll be left scratching your arse all winter,if you try sealing be ready for lots of headache because people think it comes with a 2 year gaurantee and will burn your head out when it blooms,if you do seal only do it when and if the weather is sunny for at least a week,even then your chancing it. Advanced Sealing Solutions are a brilliant company,ask for Drew.I just had a printed concrete drive bloom on me 6 months after sealing it,think it was due to ice and salt,my head was wrecked,sealing solutions sent me some xylene to spray on it and it came back spot on straight away,brilliant company and they are always willing to give advice.good luck Dan