Block paving maintenance - Advice please on weed/grass

[Spitfire]

Hi lads,

Been doing garden maintenance for quite some time, one of my customers has at least 120sqm driveway, grass around 3 sides.

Does anyone know a really good product to get rid of weeds and grass? I don't have any sprayin licenses to use the potent stuff so thought I'd ask here

Any advice appreciated

Cheers

[jonnyboyentire]

We tend to use roundup ultra 3000 (systemic) which is expensive for a litre (about £40) but at its maximum strength works well.