they say its for gum removal. what size is it?
The only thing that spot remover will do is damage the concrete. Low pressure steam, 25 degree tip, constantly moving and at about a 30 degree angle from the gum and gum residue. Melt the gum away slowly, and never will you cause any damage to your customers concrete.
Or use high pressure and a zero degree or 15 degree tip, damage your customers contract, lose your customer and probably pay a large insurance claim.
can you get it of with useing 190F water?